## A person used spacs of power - 0.5D which of distance of far point of his eyes?

Anonymous User tag : Physics 14 Aug, 2022 79 views

## Energy of a charged conductor

Anonymous User tag : Physics 28 Jun, 2022 61 views

## A small object of mass m falls from a height equal to radius of earth Re. If Me be the mass of earth what is time taken by the particle to reach the earth surface?

Anonymous User tag : Physics Gravitation and Projectile 09 Nov, 2021 80 views

## In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number (n − 1). If n >> 1, the frequency of radiation emitted is proportional to :

In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number (n − 1). If n >> 1, the frequency of radiation emitted is proportional to :

Anonymous User tag : Physics 26 Feb, 2021 79 views

## A parallel plate capacitor has a capacitance C and charge Q. Another plate is inserted in between the plates of the capacitor at the center and is connected by a long wire to another far off spherical conductor of radius R. What is the potential difference between the edge of the sphere and one of the outer plates ?

A parallel plate capacitor has a capacitance C and charge Q. Another plate is inserted in between the plates of the capacitor at the center and is connected by a long wire to another far off spherical conductor of radius R. What is the potential difference between the edge of the sphere and one of the outer plates ?

Anonymous User tag : Physics Capacitors 19 Jan, 2021 118 views

## An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range?

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range?

Anonymous User tag : Physics 20 Nov, 2020 94 views

## A body of mass m = 3.513 kg is moving along the x-axis with a speed of 5.00 ms−1. The magnitude of its momentum is recorded as ?

A body of mass m = 3.513 kg is moving along the x-axis with a speed of 5.00 ms−1. The magnitude of its momentum is recorded as ?

Anonymous User tag : Physics 20 Nov, 2020 149 views

## While measuring the speed of sound by performing a resonance column experiment, a student gets the first resonance condition at a column length of 18 cm during winter. Repeating the same experiment during summer, she measures the column length to be x cm for the second resonance. Then

While measuring the speed of sound by performing a resonance column experiment, a student gets
the first resonance condition at a column length of 18 cm during winter. Repeating the same
experiment during summer, she measures the column length to be x cm for the second resonance.
Then

(1) 18 > x
(2) x >54
(3) 54 > x > 36
(4) 36 > x > 18

Anonymous User tag : Physics 20 Nov, 2020 89 views

## 100g of water is heated from 30C to 50C. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4148 J/kg/K):

100g of water is heated from 30C to 50C. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4148 J/kg/K):

Anonymous User tag : Physics 11 Nov, 2020 84 views

## The half life of a radioactive substance is 20 minutes. The approximate time interval (t 2- t1 ) between the time t2 when 2/3 of it has decayed and time t1 and 1/3 of it had decayed is :

The half life of a radioactive substance is 20 minutes. The approximate time interval (t 2- t1 ) between
the time t2 when 2/3 of it has decayed and time t1 and 1/3 of it had decayed is :

Anonymous User tag : Physics 11 Nov, 2020 76 views

## Energy required for the electron excitation in Li++ from the first to the third Bohr orbit is ?

Energy required for the electron excitation in Li++ from the first to the third Bohr orbit is ?

Anonymous User tag : Physics 11 Nov, 2020 70 views

## A car is fitted with a convex side-view mirror of focal length 20cm. A second car 2.8 m behind the first car is overtaking the first car at relative speed of 15 m/s. The speed of the image of the second car as seen in the mirror of the first one is?

A car is fitted with a convex side-view mirror of focal length 20cm. A second car 2.8 m behind the first car is overtaking the first car at relative speed of 15 m/s. The speed of the image of the second car as seen in the mirror of the first one is?

Anonymous User tag : Physics Ray Optics 11 Nov, 2020 103 views

## A block of mass 0.50 kg is moving with a speed of 2.00 m/s on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is?

A block of mass 0.50 kg is moving with a speed of 2.00 m/s on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is?

Anonymous User tag : Physics 28 Oct, 2020 85 views

## A wave travelling along the x-axis is described by the equation y(x, t) = 0.005 cos (αx −βt). If the wavelength and the time period of the wave are 0.08 m and 2.0 s, respectively, then α and β in appropriate units are

A wave travelling along the x-axis is described by the equation y(x, t) = 0.005 cos (αx −βt). If the wavelength and the time period of the wave are 0.08 m and 2.0 s, respectively, then α and β in appropriate units are

Anonymous User tag : Physics 28 Oct, 2020 74 views

## Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross sectional area A = 10 cm2 and length = 20 cm. If one of the solenoids has 300 turns and the other 400 turns, their mutual inductance is (μ0 = 4π × 10-7 Tm A-1)

Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross sectional area A = 10 cm2 and length = 20 cm. If one of the solenoids has 300 turns and the other 400 turns, their
mutual inductance is (μ0 = 4π × 10-7 Tm A-1)

Anonymous User tag : Physics 28 Oct, 2020 90 views

## A horizontal overhead power line is at a height of 4m from the ground and carries a current of 100 A from east to west. The magnetic field directly below it on the ground is (μ0 = 4π × 10-7 T m A-1)

A horizontal overhead power line is at a height of 4m from the ground and carries a current of 100 A from east to west. The magnetic field directly below it on the ground is (μ0 = 4π × 10-7 T m A-1)

Anonymous User tag : Physics 28 Oct, 2020 82 views

## Consider a uniform square plate of side ‘a’ and mass ‘m’. The moment of inertia of this plate about an axis perpendicular to its plane and passing through one of its corners is?

Consider a uniform square plate of side ‘a’ and mass ‘m’. The moment of inertia of this plate about an axis perpendicular to its plane and passing through one of its corners is?

Anonymous User tag : Physics 21 Oct, 2020 75 views

## A planet in a distant solar system is 10 times more massive than the earth and its radius is 10 times smaller. Given that the escape velocity from the earth is 11 kms−1, the escape velocity from the surface of the planet would be

A planet in a distant solar system is 10 times more massive than the earth and its radius is 10 times smaller. Given that the escape velocity from the earth is 11 kms−1, the escape velocity from the surface of the planet would be

Anonymous User tag : Physics 21 Oct, 2020 71 views

## Assume that a drop of liquid evaporates by decrease in its surface energy. So that its temperature remains unchanged. What should be the minimum radius of the drop for this to be possible? The surface tension is T, density of liquid is ρ and L is its latent heat of vaporization?

Assume that a drop of liquid evaporates by decrease in its surface energy. So that its temperature remains unchanged. What should be the minimum radius of the drop for this to be possible? The surface tension is T, density of liquid is ρ and L is its latent heat of vaporization?

Anonymous User tag : Physics 05 Oct, 2020 82 views

## An ideal gas enclosed in a vertical cylindrical container supports a freely moving piston of mass M. The piston and the cylinder have equal cross sectional area A. When the piston is in equilibrium, the volume of the gas is V0 and its pressure is P0. The piston is slightly displaced from the equilibrium position and released. Assuming that the system is completely isolated from its surrounding, the piston executes a simple harmonic motion with frequency?

An ideal gas enclosed in a vertical cylindrical container supports a freely moving piston of mass M. The piston and the cylinder have equal cross sectional area A. When the piston is in equilibrium, the volume of the gas is V0 and its pressure is P0. The piston is slightly displaced from the equilibrium position and released. Assuming that the system is completely isolated from its surrounding, the piston executes a simple harmonic motion with frequency?

Anonymous User tag : Physics 05 Oct, 2020 84 views

## A hoop of radius r and mass m rotating with an angular velocity ω0 is placed on a rough horizontal surface. The initial velocity of the centre of the hoop is zero. What will be the velocity of the centre of the hoop when it ceases to slip?

A hoop of radius r and mass m rotating with an angular velocity ω0 is placed on a rough horizontal surface. The initial velocity of the centre of the hoop is zero. What will be the velocity of the centre of the hoop when it ceases to slip?

Anonymous User tag : Physics 05 Oct, 2020 92 views

## A beam of unpolarised light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45° relative to that of A. The intensity of the emergent light is :

A beam of unpolarised light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45° relative to that of A. The intensity of the emergent light is :

Anonymous User tag : Physics 04 Oct, 2020 73 views

## A diode detector is used to detect an amplitude modulated wave of 60% modulation by using a condenser of capacity 250 pico farad in parallel with a load resistance 100 kilo ohm. Find the maximum modulated frequency which could be detected by it.

A diode detector is used to detect an amplitude modulated wave of 60% modulation by using a condenser of capacity 250 pico farad in parallel with a load resistance 100 kilo ohm. Find the maximum modulated frequency which could be detected by it.

Anonymous User tag : Physics Capacitors 04 Oct, 2020 68 views

## Diameter of a plano - convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2 × 108 m/s, the focal length of the lens is :

Diameter of a plano - convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2 × 108 m/s, the focal length of the lens is :

Anonymous User tag : Physics 04 Oct, 2020 76 views

## A sonometer wire of length 1.5 m is made of steel. The tension in it produce an elastic strain of 1%. What is the fundamental frequency of steel if density and elasticity of steel are 7.7 × 103 kg / m3 and 2.2 × 1011 N/m2 respectively ?

A sonometer wire of length 1.5 m is made of steel. The tension in it produce an elastic strain of 1%. What is the fundamental frequency of steel if density and elasticity of steel are 7.7 × 103 kg / m3 and 2.2 × 1011 N/m2 respectively ?

Anonymous User tag : Physics 04 Oct, 2020 78 views

## The amplitude of a damped oscillator decreases to 0.9 times its original magnitude in 5s. In another 10s it will decrease to α times its original magnitude?

The amplitude of a damped oscillator decreases to 0.9 times its original magnitude in 5s. In another 10s it will decrease to α times its original magnitude?

Anonymous User tag : Physics 04 Oct, 2020 80 views

## A Projectile is given an initial velocity of (i + 2 j) m/s, where i is along the ground and j is along the vertical. If g = 10 m/s2, the equation of its trajectory is ?

A Projectile is given an initial velocity of (i + 2 j) m/s, where i is along the ground and j is along the vertical. If g = 10 m/s2, the equation of its trajectory is?

Anonymous User tag : Physics 04 Oct, 2020 71 views

## A uniform cylinder of length L and mass M having cross - sectional area A is suspended, with its length vertical, from a fixed point by a massless spring, such that it is half submerged in a liquid of density σ at equilibrium position. The extension x0 of the spring when it is in equilibrium is :

A uniform cylinder of length L and mass M having cross - sectional area A is suspended, with its length vertical, from a fixed point by a massless spring, such that it is half submerged in a liquid of density σ at equilibrium position. The extension x0 of the spring when it is in equilibrium is :

Anonymous User tag : Physics 04 Oct, 2020 74 views

## In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number (n − 1). If n >> 1, the frequency of radiation emitted is proportional to :

In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number (n − 1). If n >> 1, the frequency of radiation emitted is proportional to :

Anonymous User tag : Physics 02 Oct, 2020 67 views

## reflecting telescope has a large mirror for its objective with radius of curvature equal to 0.80m. What is the magnifying power of the telescope if teh eyepice used has a focal length of 0.016m?

Anonymous User tag : Physics 29 Sep, 2020 73 views

## How to solve numericals in physics?

Students have lots of issues in academics because they have many burdens of academics and it is very important for them. They never skip any work because If they skip any work so teachers give them bad remarks in the work so therefore every student do the hard work to getting good remarks. Well, nowadays many medical students are very troubled about the subject of Physics. The subject is very hectic, boring, and time-consuming. Mostly students face issues in numerical because it is very technical and it need the best skills that do not have with every student. Some of the students also take online help with experts where every student hires to write my assignment at cheap price. But, every time they do not afford them and now they want to get perfect solutions. They want that somebody provides the numerical tips that how to solve physics numerical.

Anthony Anson tag : Physics 11 Sep, 2020 143 views

## A bullet of mass 10g travelling horizontally with a velocity of 300 m/s strikes a block of wood of mass 290 g which rests on a rough horizontal floor. After impact the block and the bullet move together and come to rest when the block has travelled a distance of 15 m. The coefficient of friction between the block and the floor will be - (Duration of impact is very short)

A bullet of mass 10g travelling horizontally with a velocity of 300 m/s strikes a block of wood of mass 290 g which rests on a rough horizontal floor. After impact the block and the bullet move together and come to rest when the block has travelled a distance of 15 m. The coefficient of friction between the block and the floor will be - (Duration of impact is very short)

Anonymous User tag : Physics Work Power and Energy 26 Aug, 2020 76 views

## A 20 g bullet pierces through a plate of mass m1 = 1 kg and then comes to rest inside a second plate of mass m2 = 2.98 kg. It is found that the two plates, initially at rest, now move with equal velocities. The percentage loss in the initial velocity of bullet when it is between m1 and m2. (Neglect any loss of material of the bodies, due to action of bullet.) will be

A 20 g bullet pierces through a plate of mass m1 = 1 kg and then comes to rest inside a second plate of mass m2 = 2.98 kg. It is found that the two plates, initially at rest, now move with equal velocities. The percentage loss in the initial velocity of bullet when it is between m1 and m2. (Neglect any loss of material of the bodies, due to action of bullet.) will be

Anonymous User tag : Physics Work Power and Energy 26 Aug, 2020 175 views

## The mass of a rocket is 500 kg and the relative velocity of the gases ejecting from it is 250 m/s with respect to the rocket. The rate of burning of the fuel in order to give the rocket an initial acceleration 20 m/s2 in the vertically upward direction (g = 10 m/s2), will be

The mass of a rocket is 500 kg and the relative velocity of the gases ejecting from it is 250 m/s with respect to the rocket. The rate of burning of the fuel in order to give the rocket an initial acceleration 20 m/s2 in the vertically upward direction (g = 10 m/s2), will be

Anonymous User tag : Physics Work Power and Energy 26 Aug, 2020 98 views

## A slow moving electron collides elastically with a hydrogen atom at rest. The initial and final motions are along the same straight line. What fraction of electron's kinetic energy is transferred to the hydrogen atom? The mass of hydrogen atom is 1850 times the mass of electron?

A slow moving electron collides elastically with a hydrogen atom at rest. The initial and final motions are along the same straight line. What fraction of electron's kinetic energy is transferred to the hydrogen atom? The mass of hydrogen atom is 1850 times the mass of electron?

Anonymous User tag : Physics Work Power and Energy 26 Aug, 2020 186 views

## A particle of mass 4 m which is at rest explodes into three fragments, two of the fragments each of mass m are found to move each with a speed v making an angle 90 with each other. The total energy relased in this explosion is -

A particle of mass 4 m which is at rest explodes into three fragments, two of the fragments each of mass m are found to move each with a speed v making an angle 90 with each other. The total energy relased in this explosion is -

Anonymous User tag : Physics Work Power and Energy 26 Aug, 2020 87 views

## The angular momentum of a system of particles is conserved

The angular momentum of a system of particles is conserved

Anonymous User tag : Physics Circular and Rotational Motion 26 Aug, 2020 74 views

## An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. What torque does it deliver?

An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. What torque does it deliver?

Anonymous User tag : Physics Circular and Rotational Motion 26 Aug, 2020 75 views

## A particle performs uniform circular motion with an angular momentum L. If the frequency of a particle's motion is doubled and its kinetic energy is halved, the angular momentum becomes.

A particle performs uniform circular motion with an angular momentum L. If the frequency of a particle's motion is doubled and its kinetic energy is halved, the angular momentum becomes.

Anonymous User tag : Physics Circular and Rotational Motion 26 Aug, 2020 66 views

## A constant torque of 1000 N -m, turns a wheel of moment of inertia 200 kg -m2 about an axis passing through the centre. Angular velocity of the wheel after 3 s will be

A constant torque of 1000 N -m, turns a wheel of moment of inertia 200 kg -m2 about an axis passing through the centre. Angular velocity of the wheel after 3 s will be

Anonymous User tag : Physics Circular and Rotational Motion 26 Aug, 2020 63 views

## A torque of 30 N-m is applied on a 5 kg wheel whose moment of inertia is 2kg-m2 for 10 sec. The angle covered by the wheel in 10 sec will be

A torque of 30 N-m is applied on a 5 kg wheel whose moment of inertia is 2kg-m2 for 10 sec. The angle covered by the wheel in 10 sec will be

Anonymous User tag : Physics Circular and Rotational Motion 26 Aug, 2020 73 views

## A child is standing with folded hands at the centre of a platform rotating about its central axis. The kinetic energy of the system is K. The child now stretches his arms so that the moment of inertia of the system doubles. The kinetic energy of the system now is

A child is standing with folded hands at the centre of a platform rotating about its central axis. The kinetic energy of the system is K. The child now stretches his arms so that the moment of inertia of the system doubles. The kinetic energy of the system now is

Anonymous User tag : Physics Circular and Rotational Motion 26 Aug, 2020 70 views

## A wheel rotates with a constant acceleration of 2.0 radian/sec2. It the wheel starts from rest, the number of revolutions it makes in the first ten seconds will be approximately

A wheel rotates with a constant acceleration of 2.0 radian/sec2. It the wheel starts from rest, the number of revolutions it makes in the first ten seconds will be approximately

Anonymous User tag : Physics Circular and Rotational Motion 26 Aug, 2020 70 views

## Two discs of the samematerial and thickness have radii 0.2 m and 0.6 m. Their moments of inertia about their axes willbe in the ratio of

Two discs of the samematerial and thickness have radii 0.2 m and 0.6 m. Their moments of inertia about their axes will
be in the ratio of

Anonymous User tag : Physics Circular and Rotational Motion 26 Aug, 2020 74 views

## question 1

question 1

Anonymous User tag : Physics 26 Aug, 2020 67 views

## kjdhfkshd

kjdhfkshd

Anonymous User tag : Physics 26 Aug, 2020 71 views

## Question

Question

Anonymous User tag : Physics 26 Aug, 2020 77 views

## If a current is passed through a spring then the spring will

If a current is passed through a spring then the spring will

Anonymous User tag : Physics Magnetic Effect of Current 26 Aug, 2020 65 views

## The time period of a charged particle undergoing in a circular motion in a uniform magnetic field is independent of its

The time period of a charged particle undergoing in a circular motion in a uniform magnetic field is independent of its

Anonymous User tag : Physics Magnetic Effect of Current 26 Aug, 2020 70 views

## The given electric Network is equivalent to?

The given electric Network is equivalent to?

1. AND GATE

2. OR GATE

3. NOR GATE

4. NOT GATE

Anonymous User tag : Physics 13 Aug, 2020 70 views

## Acceleration of a particle is given by : a = 2t+3. If initial velocity of the particle is 3 m/s at t =0 .Find velocity at the end of 3 sec.

Acceleration of a particle is given by : a = 2t+3. If initial velocity of the particle is 3 m/s at t =0 .Find velocity at the end of 3 sec.

Anonymous User tag : Physics 13 Aug, 2020 91 views

## A uniform string of length 20 m is suspended from rigid support. A short wave pulse is introduced at lowest end and it starts moving up.What is time taken to reach the support?

A uniform string of length 20 m is suspended from rigid support. A short wave pulse is introduced at lowest end and it starts moving up.What is time taken to reach the support?

Anonymous User tag : Physics 31 Jul, 2020 72 views

## Space between two concentric conducting spheres of radii a and b (b>a) is filled the medium of resistivity p.The resistance between two spheres is?

Space between two concentric conducting spheres of radii a and b (b>a) is filled the medium of resistivity .The resistance between two spheres is?

Anonymous User tag : Physics 29 Jul, 2020 86 views

## A ball is thrown upward with an initial velocity v0 from the surface of the earth.The motion of the ball is affected by a drag force equal to myv*v(where m is mass of the ball, v is the instantaneous velocity and y is constant).Time taken by the ball to rise to its zenith is?

A ball is thrown upward with an initial velocity  from the surface of the earth.The motion of the ball is affected by a drag force equal to (where m is mass of the ball, v is the instantaneous velocity and  is constant).Time taken by the ball to rise to its zenith is?

Anonymous User tag : Physics 26 Jul, 2020 131 views

## A particle performs uniform circular motion with an angular momentum L. If the frequency of a particle's motion is doubled and its kinetic energy is halved, the angular momentum becomes.

A particle performs uniform circular motion with an angular momentum L. If the frequency of a particle's motion is doubled and its kinetic energy is halved, the angular momentum becomes.

Anonymous User tag : Physics Circular and Rotational Motion 25 Jul, 2020 65 views

## A constant torque of 1000 N -m, turns a wheel of moment of inertia 200 kg -m2 about an axis passing through the centre. Angular velocity of the wheel after 3 s will be

A constant torque of 1000 N -m, turns a wheel of moment of inertia 200 kg -m2 about an axis passing through the centre. Angular velocity of the wheel after 3 s will be

Anonymous User tag : Physics Circular and Rotational Motion 25 Jul, 2020 70 views

## A torque of 30 N-m is applied on a 5 kg wheel whose moment of inertia is 2kg-m2 for 10 sec. The angle covered by the wheel in 10 sec will be

A torque of 30 N-m is applied on a 5 kg wheel whose moment of inertia is 2kg-m2 for 10 sec. The angle covered by the wheel in 10 sec will be

Anonymous User tag : Physics Circular and Rotational Motion 25 Jul, 2020 147 views

## A child is standing with folded hands at the centre of a platform rotating about its central axis. The kinetic energy of the system is K. The child now stretches his arms so that the moment of inertia of the system doubles. The kinetic energy of the system now is

A child is standing with folded hands at the centre of a platform rotating about its central axis. The kinetic energy of the system is K. The child now stretches his arms so that the moment of inertia of the system doubles. The kinetic energy of the system now is

Anonymous User tag : Physics Circular and Rotational Motion 25 Jul, 2020 74 views

## A wheel rotates with a constant acceleration of 2.0 radian/sec2. It the wheel starts from rest, the number of revolutions it makes in the first ten seconds will be approximately

A wheel rotates with a constant acceleration of 2.0 radian/sec2. It the wheel starts from rest, the number of revolutions it makes in the first ten seconds will be approximately

Anonymous User tag : Physics Gravitation and Projectile 25 Jul, 2020 71 views

## A uniform rectangular thin sheet ABCD of mass M has a length a and breadth b as shown in a figure.If the shaded portion HBGO is cut off then what will be the co-ordinate of the centre of mass of remaining portion.

A uniform rectangular thin sheet ABCD of mass M has a length a and breadth b as shown in a figure.If the shaded portion HBGO is cut off then what will be the co-ordinate of the centre of mass of remaining portion.

Anonymous User tag : Physics 24 Jul, 2020 94 views

## What is a escape velocity and its Expression.Explain?

What is a escape velocity and its Expression.Explain?

Anonymous User tag : Physics 24 Jul, 2020 73 views

## The acceleration due to gravity on the planet A is 9 times of the acceleration due to gravity on the planet B. A man jumps to a height of 2 m from the surface of planet A. What is height of jump of same person on planet B

The acceleration due to gravity on the planet A is 9 times of the acceleration due to gravity on the planet B. A man jumps to a height of 2 m from the surface of planet A. What is height of jump of same person on planet B

Anonymous User tag : Physics 24 Jul, 2020 70 views

## The angular momentum of a system of particles is conserved

The angular momentum of a system of particles is conserved

Anonymous User tag : Physics Circular and Rotational Motion 24 Jul, 2020 73 views

## An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. What torque does it deliver?

An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. What torque does it deliver?

Anonymous User tag : Physics Circular and Rotational Motion 24 Jul, 2020 78 views

## What is Work - Energy Principle? Please explain.

What is Work - Energy Principle? Please explain.

Anonymous User tag : Physics Work Power and Energy 23 Jul, 2020 85 views

## The moment of inertia of a uniform cylinder of length l and radius R about its perpendicular bisector is I. What is the ratio of l/R such the moment of inertia is minimum?

The moment of inertia of a uniform cylinder of length l and radius R about its perpendicular bisector is I. What is the ratio of l/R such the moment of inertia is minimum?

Anonymous User tag : Physics 23 Jul, 2020 79 views

## A bullet of mass 10g travelling horizontally with a velocity of 300 m/s strikes a block of wood of mass 290 g which rests on a rough horizontal floor. After impact the block and the bullet move together and come to rest when the block has travelled a distance of 15 m. The coefficient of friction between the block and the floor will be - (Duration of impact is very short)

A bullet of mass 10g travelling horizontally with a velocity of 300 m/s strikes a block of wood of mass 290 g which rests on a rough horizontal floor. After impact the block and the bullet move together and come to rest when the block has travelled a distance of 15 m. The coefficient of friction between the block and the floor will be - (Duration of impact is very short)

Anonymous User tag : Physics Work Power and Energy 19 Jul, 2020 69 views

## A 20 g bullet pierces through a plate of mass m1 = 1 kg and then comes to rest inside a second plate of mass m2 = 2.98 kg. It is found that the two plates, initially at rest, now move with equal velocities. The percentage loss in the initial velocity of bullet when it is between m1 and m2. (Neglect any loss of material of the bodies, due to action of bullet.) will be

A 20 g bullet pierces through a plate of mass m1 = 1 kg and then comes to rest inside a second plate of mass m2 = 2.98 kg. It is found that the two plates, initially at rest, now move with equal velocities. The percentage loss in the initial velocity of bullet when it is between m1 and m2. (Neglect any loss of material of the bodies, due to action of bullet.) will be

Anonymous User tag : Physics Work Power and Energy 19 Jul, 2020 80 views

## The mass of a rocket is 500 kg and the relative velocity of the gases ejecting from it is 250 m/s with respect to the rocket. The rate of burning of the fuel in order to give the rocket an initial acceleration 20 m/s2 in the vertically upward direction (g = 10 m/s2), will be

The mass of a rocket is 500 kg and the relative velocity of the gases ejecting from it is 250 m/s with respect to the rocket. The rate of burning of the fuel in order to give the rocket an initial acceleration 20 m/s2 in the vertically upward direction (g = 10 m/s2), will be

Anonymous User tag : Physics Work Power and Energy 19 Jul, 2020 82 views

## A slow moving electron collides elastically with a hydrogen atom at rest. The initial and final motions are along the same straight line. What fraction of electron's kinetic energy is transferred to the hydrogen atom? The mass of hydrogen atom is 1850 times the mass of electron?

A slow moving electron collides elastically with a hydrogen atom at rest. The initial and final motions are along the same straight line. What fraction of electron's kinetic energy is transferred to the hydrogen atom? The mass of hydrogen atom is 1850 times the mass of electron?

Anonymous User tag : Physics Work Power and Energy 19 Jul, 2020 94 views

## A particle of mass 4 m which is at rest explodes into three fragments, two of the fragments each of mass m are found to move each with a speed v making an angle 90 with each other. The total energy relased in this explosion is -

A particle of mass 4 m which is at rest explodes into three fragments, two of the fragments each of mass m are found to move each with a speed v making an angle 90 with each other. The total energy relased in this explosion is -

Anonymous User tag : Physics Work Power and Energy 19 Jul, 2020 80 views

## A boy pulls a 5 kg block 20 metres along a horizontal sur- face at a constant speed with a force directed 45° above the horizontal. If the coefficient of kinetic friction is 0.20, how much work does the boy do on the block?

A boy pulls a 5 kg block 20 metres along a horizontal sur- face at a constant speed with a force directed 45° above the horizontal. If the coefficient of kinetic friction is 0.20, how much work does the boy do on the block?

Anonymous User tag : Physics Work Power and Energy 18 Jul, 2020 101 views

## A uniform chain is held on a frictionless table with one- fifth of its length hanging over the edge. If the chain has a length l and a mass m, how much work is required to pull the hanging part back on the table ?

A uniform chain is held on a frictionless table with one- fifth of its length hanging over the edge. If the chain has a length l and a mass m, how much work is required to pull the hanging part back on the table ?

Anonymous User tag : Physics Work Power and Energy 18 Jul, 2020 78 views

## A bus of mass 1000 kg has an engine which produces a constant power of 50 kW. If the resistance to motion, assumed constant is 1000 N. The maximum speed at which the bus can travel on level road and the acceleration when it is travelling at 25 m/s, will respectively be?

A bus of mass 1000 kg has an engine which produces a constant power of 50 kW. If the resistance to motion, assumed constant is 1000 N. The maximum speed at which the bus can travel on level road and the acceleration when it is travelling at 25 m/s, will respectively be?

Anonymous User tag : Physics Work Power and Energy 18 Jul, 2020 103 views

## A particle of mass m is moving in a horizontal circle of radius r, under a centripetal force equal to (–k/r2), where kis a constant. The total energy of the particle is

A particle of mass m is moving in a horizontal circle of radius r, under a centripetal force equal to (–k/r2), where k
is a constant. The total energy of the particle is

Anonymous User tag : Physics Work Power and Energy 18 Jul, 2020 76 views

## The work done by a person in carrying a box of mass 10 kg through a vertical height of 10 m is 4900 J. The mass of the person is

The work done by a person in carrying a box of mass 10 kg through a vertical height of 10 m is 4900 J. The mass of the person is

Anonymous User tag : Physics Work Power and Energy 18 Jul, 2020 81 views

## A uniform rod of length 4 m and mass 20 kg is lying horizontal on the ground. The work done in keeping it vertical with one of its ends touching the ground, will be

A uniform rod of length 4 m and mass 20 kg is lying horizontal on the ground. The work done in keeping it vertical with one of its ends touching the ground, will be

Anonymous User tag : Physics Work Power and Energy 18 Jul, 2020 103 views

## A rifle man,who together with his rifle has a mass of 100 kg, stands on a smooth surface fires 10 shots horizontally. Each bullet has a mass 10 gm and a muzzle velocity of 800 m/s. What velocity does rifle man acquire at the end of 10 shots

A rifle man,who together with his rifle has a mass of 100 kg, stands on a smooth surface fires 10 shots horizontally. Each bullet has a mass 10 gm and a muzzle velocity of 800 m/s. What velocity does rifle man acquire at the end of 10 shots

Anonymous User tag : Physics Work Power and Energy 18 Jul, 2020 75 views

## A body is acted upon by a force F=-i+2j+3k.The work done by the force in displacing it from (0,0,0) to (0,0,4m) will be?

A body is acted upon by a force F=-i+2j+3k.The work done by the force in displacing it from (0,0,0) to (0,0,4m) will be?

Anonymous User tag : Physics Work Power and Energy 17 Jul, 2020 196 views

## The work done in pulling a body of mass 5 kg along an inclined plane (angle 60) with coefficient of friction 0.2 through 2 m,will be?

The work done in pulling a body of mass 5 kg along an inclined plane (angle 60) with coefficient of friction 0.2 through 2 m,will be?

Anonymous User tag : Physics Work Power and Energy 17 Jul, 2020 87 views

## A force F =(7–2x+3x*x )N is applied on a 2kg mass which displaces it from x = 0 to x = 5 m. Work done in joule is ?

A force F =(7–2x+3x*x )N is applied on a 2kg mass which displaces it from x = 0 to x = 5 m. Work done in joule is ?

Anonymous User tag : Physics Work Power and Energy 17 Jul, 2020 65 views

## An automobile of mass m accelerates from rest. If the engine supplies a constant power P, the velocity at time t is given by

An automobile of mass m accelerates from rest. If the engine supplies a constant power P, the velocity at time t is given by

Anonymous User tag : Physics Work Power and Energy 17 Jul, 2020 67 views

## A chain of linear density 3 kg /m and length 8 m is lying on the table with 4 m of chain hanging from the edge. The work done in lifting the chain on the table will be ?

A chain of linear density 3 kg /m and length 8 m is lying on the table with 4 m of chain hanging from the edge. The work done in lifting the chain on the table will be ?

Anonymous User tag : Physics Work Power and Energy 17 Jul, 2020 113 views

## The work done in lifting water from a well of depth 6 m using a bucket of mass 0.5 kg and volume 2 litre, will be

The work done in lifting water from a well of depth 6 m using a bucket of mass 0.5 kg and volume 2 litre, will be

Anonymous User tag : Physics Work Power and Energy 17 Jul, 2020 123 views

## An object of mass 5 kg falls from rest through a vertical distance of 20 m and reaches a velocity of 10 m/s. How much work is done by the push of the air on the object ? (g = 10 m/s2).

An object of mass 5 kg falls from rest through a vertical distance of 20 m and reaches a velocity of 10 m/s. How much work is done by the push of the air on the object ? (g = 10 m/s2).

Anonymous User tag : Physics Work Power and Energy 17 Jul, 2020 72 views

## A particle moves in the X-Y plane under the influence of a force such that its linear momentum is p(t ) = A[i cos(kt ) - j sin(kt )] , where A and k are constants. The angle between the force and the momentum is?

A particle moves in the X-Y plane under the influence of a force such that its linear momentum is p(t ) = A[i cos(kt ) - j sin(kt )] , where A and k are constants. The angle between the force and the momentum is?

Anonymous User tag : Physics Laws of Motion and Friction 17 Jul, 2020 86 views

## A block is moving on an inclined plane making an angle 45° with the horizontal and the coefficient of friction is u . The force required to just push it up the inclined plane is 3 times the force required to just prevent it from sliding down. If we define N = 10 u, then N is

A block is moving on an inclined plane making an angle 45° with the horizontal and the coefficient of friction is . The force required to just push it up the inclined plane is 3 times the force required to just prevent it from sliding down. If we define N = 10 , then N is

Anonymous User tag : Physics Laws of Motion and Friction 15 Jul, 2020 108 views

## Two spherical planets P and Q have the same uniform density , masses MP and MQ, and surface areas A and 4A, respectively. A spherical planet R also has uniform density  and its mass is (MP + MQ). The escape velocities from the planets P, Q and R, are VP, VQ and VR, respectively. ThenTwo spherical planets P and Q have the same uniform density, masses MP and MQ, and surface areas A and 4A, respectively. A spherical planet R also has uniform density  and its mass is (MP + MQ). The escape velocities from the planets P, Q and R, are VP, VQ and VR, respectively. Then

Two spherical planets P and Q have the same uniform density , masses MP and MQ, and surface areas A and 4A, respectively. A spherical planet R also has uniform density  and its mass is (MP + MQ). The escape velocities from the planets P, Q and R, are VP, VQ and VR, respectively. ThenTwo spherical planets P and Q have the same uniform density, masses MP and MQ, and surface areas A and 4A, respectively. A spherical planet R also has uniform density  and its mass is (MP + MQ). The escape velocities from the planets P, Q and R, are VP, VQ and VR, respectively. Then

Anonymous User tag : Physics Gravitation and Projectile 25 Jun, 2020 74 views

## Two bodies, each of mass M, are kept fixed with a separation 2L. A particle of mass m is projected from the midpoint of the line joining their centres, perpendicular to the line. The gravitational constant is G. The correct statement(s) is (are)

Two bodies, each of mass M, are kept fixed with a separation 2L. A particle of mass m is projected from the midpoint of the line joining their centres, perpendicular to the line. The gravitational constant is G. The correct statement(s) is (are)

Anonymous User tag : Physics Gravitation and Projectile 25 Jun, 2020 84 views

## Suppose the radius of earth is half of its present value (Mass remaining unchanged). The value of g at a height equal to the final radius is 10x m/s2. Find the value of x.

Suppose the radius of earth is half of its present value (Mass remaining unchanged). The value of g at a height equal to the final radius is 10x m/s2. Find the value of x.

Anonymous User tag : Physics Gravitation and Projectile 25 Jun, 2020 74 views

## A point mass when enters d depth below the earth’s surface such that the g reduces by 1% then the value of d is [Take Re = 6400 km]

A point mass when enters d depth below the earth’s surface such that the g reduces by 1% then the value of d is [Take Re = 6400 km]

Anonymous User tag : Physics Gravitation and Projectile 23 Jun, 2020 113 views

## The ratio between masses of two planets is 3 : 5 and the ratio between their radii is 5 : 3. The ratio betweentheir acceleration due to gravity will be

The ratio between masses of two planets is 3 : 5 and the ratio between their radii is 5 : 3. The ratio between
their acceleration due to gravity will be

Anonymous User tag : Physics Gravitation and Projectile 23 Jun, 2020 68 views

## The weight of an object on the surface of the Earth is 40 N. Its weight at a height equal to the radius of the Earth is

The weight of an object on the surface of the Earth is 40 N. Its weight at a height equal to the radius of the Earth is

Anonymous User tag : Physics Gravitation and Projectile 23 Jun, 2020 73 views

## Two spherical planets P and Q have the same uniform density , masses MP and MQ, and surface areas A and 4A, respectively. A spherical planet R also has uniform density  and its mass is (MP + MQ). The escape velocities from the planets P, Q and R, are VP, VQ and VR, respectively. ThenTwo spherical planets P and Q have the same uniform density, masses MP and MQ, and surface areas A and 4A, respectively. A spherical planet R also has uniform density  and its mass is (MP + MQ). The escape velocities from the planets P, Q and R, are VP, VQ and VR, respectively. Then

Two spherical planets P and Q have the same uniform density , masses MP and MQ, and surface areas A and 4A, respectively. A spherical planet R also has uniform density  and its mass is (MP + MQ). The escape velocities from the planets P, Q and R, are VP, VQ and VR, respectively. ThenTwo spherical planets P and Q have the same uniform density, masses MP and MQ, and surface areas A and 4A, respectively. A spherical planet R also has uniform density  and its mass is (MP + MQ). The escape velocities from the planets P, Q and R, are VP, VQ and VR, respectively. Then

Anonymous User tag : Physics Gravitation and Projectile 23 Jun, 2020 72 views

## Two bodies, each of mass M, are kept fixed with a separation 2L. A particle of mass m is projected from the midpoint of the line joining their centres, perpendicular to the line. The gravitational constant is G. The correct statement(s) is (are)

Two bodies, each of mass M, are kept fixed with a separation 2L. A particle of mass m is projected from the midpoint of the line joining their centres, perpendicular to the line. The gravitational constant is G. The correct statement(s) is (are)

Anonymous User tag : Physics Gravitation and Projectile 23 Jun, 2020 70 views

## Suppose the radius of earth is half of its present value (Mass remaining unchanged). The value of g at a height equal to the final radius is 10x m/s2. Find the value of x.

Suppose the radius of earth is half of its present value (Mass remaining unchanged). The value of g at a height equal to the final radius is 10x m/s2. Find the value of x.

Anonymous User tag : Physics Gravitation and Projectile 23 Jun, 2020 89 views

## Which of the following quantities related to planets remains same during their motion in elliptical orbits as seen from the sun?

Which of the following quantities related to planets remains same during their motion in elliptical orbits as seen from the sun?

Anonymous User tag : Physics Gravitation and Projectile 22 Jun, 2020 62 views

## The time period of a satellite of the earth is 10 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, then what will be the new time period of the satellite?

The time period of a satellite of the earth is 10 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, then what will be the new time period of the satellite?

Anonymous User tag : Physics Gravitation and Projectile 22 Jun, 2020 63 views

## A planet is at R distance from sun and its time period of revolution is T. What will be its new time period of revolution if it is brought 0.5 R distance closer to sun?

A planet is at R distance from sun and its time period of revolution is T. What will be its new time period of revolution if it is brought 0.5 R distance closer to sun?

Anonymous User tag : Physics Gravitation and Projectile 22 Jun, 2020 61 views

## If the change in value of g at a height h above the surface of the earth is same as that at a depth d below it, when both h and d are much smaller than the radius of the earth, then

If the change in value of g at a height h above the surface of the earth is same as that at a depth d below it, when both h and d are much smaller than the radius of the earth, then

Anonymous User tag : Physics Gravitation and Projectile 22 Jun, 2020 59 views

## If the radius of earth were to shrink by one percent and mass remains same, then acceleration due to gravity on the surface of the earth would

If the radius of earth were to shrink by one percent and mass remains same, then acceleration due to gravity on the surface of the earth would

Anonymous User tag : Physics Gravitation and Projectile 22 Jun, 2020 70 views

## A stone is dropped from a minar of height h and it reaches after t seconds on earth. From the same minar if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the earth surface after t1 and t2 seconds respectively, then

A stone is dropped from a minar of height h and it reaches after t seconds on earth. From the same minar if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the earth surface after t1 and t2 seconds respectively, then

Anonymous User tag : Physics Laws of Motion and Friction 06 Jun, 2020 209 views

## A ball is projected upwards from a height h above the surface of the earth with velocity v. The time at which the ball strikes the ground is

A ball is projected upwards from a height h above the surface of the earth with velocity v. The time at which the ball strikes the ground is

Anonymous User tag : Physics Laws of Motion and Friction 06 Jun, 2020 230 views

## A man throws balls with the same speed vertically upwards, one after the other at an interval of 2 seconds. What should be the speed of the throw so that more than two balls are in the sky at any time? (Given g = 9.8 m/s2)

A man throws balls with the same speed vertically upwards, one after the other at an interval of 2 seconds. What should be the speed of the throw so that more than two balls are in the sky at any time? (Given g = 9.8 m/s2)

Anonymous User tag : Physics Laws of Motion and Friction 06 Jun, 2020 77 views

## A car is moving with c/2 a stone is thrown from the car with speed c/root 2 at 45 degree with the direction of velocity of the car. What is the angle as seen from the ground?

A car is moving with c/2 a stone is thrown from the car with speed c/root 2 at 45 degree with the direction of velocity of the car. What is the angle as seen from the ground?

Anonymous User tag : Physics 06 Jun, 2020 75 views

## A car starts moving rectilinearly, first with acceleration 5 m/s^2 (the initial velocity is equal to zero), then uniformly , and finaly , decelerating at the same rate, comes to stop.Total time of motion equals to 25 sec . The avg velocity during that time is equal to 72 km/hr .How long does the car move uniformly?

A car starts moving rectilinearly, first with acceleration 5 m/s^2 (the initial velocity is equal to zero), then uniformly , and finaly , decelerating at the same rate, comes to stop.Total time of motion equals to 25 sec . The avg velocity during that time is equal to 72 km/hr .How long does the car move uniformly?

Anonymous User tag : Physics 05 Jun, 2020 97 views

## Find the angle of projection at when horizontal range and maximum height of a projectile are equal?

Find the angle of projection at when horizontal range and maximum height of a projectile are equal?

Anonymous User tag : Physics Kinematics 04 Jun, 2020 107 views

## A swimmer wants to reach to a point just opposite on the other bank of the river. How should he swim and why?

A swimmer wants to reach to a point just opposite on the other bank of the river. How should he swim and why?

Anonymous User tag : Physics Kinematics 04 Jun, 2020 570 views

## A ball is dropped gently from the top of tower and another ball is thrown horizontally at same time.Which ball will hit the ground first?

A ball is dropped gently from the top of tower and another ball is thrown horizontally at same time.Which ball will hit the ground first?

Anonymous User tag : Physics Kinematics 04 Jun, 2020 140 views

## A stone is projected horizontally with 20 m/s from top of a tall building. Calculate its position and velocity after 3 sec neglecting the air resistance?

A stone is projected horizontally with 20 m/s from top of a tall building. Calculate its position and velocity after 3 sec neglecting the air resistance?

Anonymous User tag : Physics Kinematics 04 Jun, 2020 71 views

## A stone is projected horizontally with 20 m/s from top of a tall building. Calculate its position and velocity after 3 sec neglecting the air resistance?

A stone is projected horizontally with 20 m/s from top of a tall building. Calculate its position and velocity after 3 sec neglecting the air resistance?

Anonymous User tag : Physics Kinematics 04 Jun, 2020 819 views

## If the displacement of a body is proportional of square of time, state whether the body is moving with uniform velocity or uniform acceleration?

If the displacement of a body is proportional of square of time, state whether the body is moving with uniform velocity or uniform acceleration?

Anonymous User tag : Physics Kinematics 03 Jun, 2020 68 views

## Two stones P and Q of different masses m and 2m respectively are dropped simultaneously from top of a tower and reach the ground with different energies . Which one is faster?

Two stones P and Q of different masses m and 2m respectively are dropped simultaneously from top of a tower and reach the ground with different energies . Which one is faster?

Anonymous User tag : Physics Kinematics 03 Jun, 2020 489 views

## Can an object with constant acceleration reverse its direction of travel ? Explain

Can an object with constant acceleration reverse its direction of travel ? Explain

Anonymous User tag : Physics Kinematics 03 Jun, 2020 77 views

## If L, C and R represent inductance, capacitance and resistance respectively, then which of the following does not represent dimensions of frequency?

If L, C and R represent inductance, capacitance and resistance respectively, then which of the following does not represent dimensions of frequency?

Anonymous User tag : Physics Units and Dimension 02 Jun, 2020 58 views

## Number of particles crossing unit area perpendicular to X-axis in unit time is given by  n =  are number of particles per unit volume in the position x1 and x2. Find dimensions of D called as diffusion constant

Number of particles crossing unit area perpendicular to X-axis in unit time is given by

n =

are number of particles per unit volume in the position x1 and x2. Find dimensions of D called as diffusion constant

Anonymous User tag : Physics Units and Dimension 02 Jun, 2020 52 views

## X = 3YZ*Z find dimensions of Y in (MKSA) system, if X and Z are the dimensions of capacity and magnetic field respectively

X = 3YZ*Z find dimensions of Y in (MKSA) system, if X and Z are the dimensions of capacity and magnetic field respectively

Anonymous User tag : Physics Units and Dimension 02 Jun, 2020 68 views

## Wavelength of ray of light is 0.00006 m. It is equal to

Wavelength of ray of light is 0.00006 m. It is equal to

Anonymous User tag : Physics Units and Dimension 02 Jun, 2020 106 views

## What is the relationship between dyne and newton of force?

What is the relationship between dyne and newton of force?

Anonymous User tag : Physics Units and Dimension 02 Jun, 2020 65 views

## The magnitude of any physical quantity

The magnitude of any physical quantity

Anonymous User tag : Physics Units and Dimension 02 Jun, 2020 64 views

## If the constant of gravitation (G), Planck's constant (h) and the velocity of light (c) be chosen as fundamental units. The dimensions of the radius of gyration is

If the constant of gravitation (G), Planck's constant (h) and the velocity of light (c) be chosen as fundamental units. The dimensions of the radius of gyration is

Anonymous User tag : Physics Units and Dimension 02 Jun, 2020 77 views

## A projectile is launched with an initial velocity of 30 m/s at angle of 60 degree above the horizontal. Calculate the magnitude and direction of its velocity 5s after launch?

A projectile is launched with an initial velocity of 30 m/s at angle of 60 degree above the horizontal. Calculate the magnitude and direction of its velocity 5s after launch?

Anonymous User tag : Physics Kinematics 02 Jun, 2020 118 views

## An object is dropped from the top of the tower of height 156.8 m and the same time another object is thrown vertically upward with velocity of 78.1 mm/s from the foot of the tower, find when and where two object meet?

An object is dropped from the top of the tower of height 156.8 m and the same time another object is thrown vertically upward with velocity of 78.1 mm/s from the foot of the tower, find when and where two object meet?

Anonymous User tag : Physics Kinematics 01 Jun, 2020 772 views

## A cannon fires successively two shells from the same point with velocity v0 = 250m/s ; the first at the angle  =60° and the second at the angle  =45° to the horizontal, the azimuth being the same. Neglecting the air drag, find the approximate time interval between firings leading to the collision of the shells (g = 9.8 m/s2.)

A cannon fires successively two shells from the same point with velocity v0 = 250m/s ; the first at the angle  =60° and the second at the angle  =45° to the horizontal, the azimuth being the same. Neglecting the air drag, find the approximate time interval between firings leading to the collision of the shells (g = 9.8 m/s2.)

Anonymous User tag : Physics 01 Jun, 2020 57 views

## Each of the two block shown in the figure has mass m. The pulley is smooth and the coefficient of friction for all surfaces in contact is . A constant horizontal force P applied in two cases shown in such a way that block A start just sliding then the value of minimum force P in case-I and case-II is :

Each of the two block shown in the figure has mass m. The pulley is smooth and the coefficient of friction for all surfaces in contact is . A constant horizontal force P applied in two cases shown in such a way that block A start just sliding then the value of minimum force P in case-I and case-II is :