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

picture

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 1 Answer 58 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)

picture

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 1 Answer 54 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

picture

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 1 Answer 54 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)

picture

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 1 Answer 53 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?

picture

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 1 Answer 51 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

picture

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 1 Answer 75 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)

picture

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 1 Answer 65 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?

picture

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 0 Answer 60 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

picture

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 1 Answer 51 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?

picture

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 1 Answer 57 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.)

picture

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 1 Answer 52 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 :

picture

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 :

Anonymous User tag : Physics 01 Jun, 2020 1 Answer 52 views


A block of mass m is pulled on an incline surface having coefficient of friction  = 1 & angle of inclination  = 30°, with the horizontal, such that required external force is minimum. The angle made by this force with the incline is :

picture

A block of mass m is pulled on an incline surface having coefficient of friction  = 1 & angle of inclination  = 30°, with the horizontal, such that required external force is minimum. The angle made by this force with the incline is :

Anonymous User tag : Physics 01 Jun, 2020 1 Answer 55 views







A projectile is fired from the ground level with a velocity of 500m/s at 30 degree to horizontal range and greatest hight to which it rises.What is the least speed with which could be projected in order to achieve the same

picture

A projectile is fired from the ground level with a velocity of 500m/s at 30 degree to horizontal range and greatest hight to which it rises.What is the least speed with which could be projected in order to achieve the same

Anonymous User tag : Physics Kinematics 31 May, 2020 1 Answer 53 views






A 0.1 kg mass is suspended from a wire of negligible mass. The length of the wire is 1 m and its cross- sectional area is 4.9 × 10–7 m2. If the mass is pulled a little in the vertically downward direction and released, it performs simple harmonic motion of angular frequency 140 rad s–1. If the Young's modulus of the material of the wire is n × 109 Nm–2, the value of n is

picture

A 0.1 kg mass is suspended from a wire of negligible mass. The length of the wire is 1 m and its cross- sectional area is 4.9 × 10–7 m2. If the mass is pulled a little in the vertically downward direction and released, it performs simple harmonic motion of angular frequency 140 rad s–1. If the Young's modulus of the material of the wire is n × 109 Nm–2, the value of n is

Anonymous User tag : Physics Oscillation 29 May, 2020 1 Answer 59 views




A Constant force f is applied on a particle of mass 'm' which is initially at rest. As the particle starts moving a resistive force -bv begins to act on it.Speed of the particle at any instant of time 't' is?

picture

A Constant force f is applied on a particle of mass 'm' which is initially at rest. As the particle starts moving a resistive force -bv begins to act on it.Speed of the particle at any instant of time 't' is?

Anonymous User tag : Physics Laws of Motion and Friction 28 May, 2020 1 Answer 59 views


A motor boat going down stream over came a raft at a point A, t = 60 min later it turned back and after some time passed the raft at a distance l = 6.0 km from the point A. Find the flow velocity assuming the duty of the engine to be constant?

picture

A motor boat going down stream over came a raft at a point A, t = 60 min later it turned back and after some time passed the raft at a distance l = 6.0 km from the point A. Find the flow velocity assuming the duty of the engine to be constant?

Anonymous User tag : Physics 26 May, 2020 1 Answer 57 views

A current carrying wire heats a metal rod. The wire provides a constant power (P) to the rod. The metal rod is enclosed in an insulated container. It is observed that the temperature (T) in the metal rod changes with time (t) as

picture

A current carrying wire heats a metal rod. The wire provides a constant power (P) to the rod. The metal rod is enclosed in an insulated container. It is observed that the temperature (T) in the metal rod changes with time (t) as

Where is a constant with appropiate dimension with is a constant with dimension of temperature .

The heat capacity of the metal is?

Anonymous User tag : Physics 26 May, 2020 1 Answer 61 views








A car is fitted with a convex side-view mirror of focal length 20 cm. A second car 2.8 m behind the first car is overtaking the first car at a relative speed of 15 m s-1. The speed of the image of the second car as seen in the mirror of the first one is

picture

A car is fitted with a convex side-view mirror of focal length 20 cm. A second car 2.8 m behind the first car is overtaking the first car at a relative speed of 15 m s-1. 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 15 May, 2020 1 Answer 57 views


Three perfect gases at absolute temperatures T1, T2 and T3 are mixed. The masses of molecules are m1, m2 and m3 and the number of molecules are n1, n2 and n3 respectively. Assuming no loss of energy, the final temperature of the mixture is

picture

Three perfect gases at absolute temperatures T1, T2 and T3 are mixed. The masses of molecules are m1, m2 and m3 and the number of molecules are n1, n2 and n3 respectively. Assuming no loss of energy, the final temperature of the mixture is

Anonymous User tag : Physics Thermodynamics 15 May, 2020 1 Answer 56 views

Two identical charged spheres suspended from a common point by two massless strings of length l are initially a distance d(d < < l) apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result the charges approach each other with a velocity v. Then as a function of distance x between them

picture

Two identical charged spheres suspended from a common point by two massless strings of length l are initially a distance d(d < < l) apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result the charges approach each other with a velocity v. Then as a function of distance x between them

Anonymous User tag : Physics Electrostatic 15 May, 2020 1 Answer 55 views


A fully charged capacitor C with initial charge q0 is connected to a coil of self-inductance L at t = 0. What is the time at which the energy is stored equally between the electric and the magnetic fields? 

picture

A fully charged capacitor C with initial charge q0 is connected to a coil of self-inductance L at t = 0. What is the time at which the energy is stored equally between the electric and the magnetic fields? 

Anonymous User tag : Physics Electromagnetic Induction & Alternating Current 15 May, 2020 1 Answer 57 views


A thin horizontal circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach its other end. During the journey of the insect, what will be the angular speed of the disc? 

picture

A thin horizontal circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach its other end. During the journey of the insect, what will be the angular speed of the disc? 

Anonymous User tag : Physics Circular and Rotational Motion 15 May, 2020 1 Answer 51 views

Let the x–z plane be the boundary between two transparent media. Medium 1 in z ≥ 0 has a refractive index of 2 and medium with z < 0 has a refractive index of . A ray of light in medium 1 given by the vector is incident on the plane of separation. What will be the angle of refraction in medium 2? 

picture

Let the x–z plane be the boundary between two transparent media. Medium 1 in z ≥ 0 has a refractive index of 2 and medium with z < 0 has a refractive index of . A ray of light in medium 1 given by the vector is incident on the plane of separation. What will be the angle of refraction in medium 2? 

Anonymous User tag : Physics Ray Optics 15 May, 2020 1 Answer 55 views

Two particles are executing simple harmonic motion of the same amplitude A and frequency w along the x-axis. Their mean position is separated by distance X0 (X0 > A). If the maximum separation between them is (X0 + A), the phase difference between their motion is

picture

Two particles are executing simple harmonic motion of the same amplitude A and frequency w along the x-axis. Their mean position is separated by distance X0 (X0 > A). If the maximum separation between them is (X0 + A), the phase difference between their motion is

Anonymous User tag : Physics Oscillation 15 May, 2020 1 Answer 53 views

Direction: The question has a paragraph followed by two statements, Statement-1 and Statement-2. Of the given four alternatives after the statements, choose the one that describes the statements. A thin air film is formed by putting the convex surface of a plane-convex lens over a plane glass plate. With monochromatic light, this film gives an interference pattern due to light reflected from the top (convex) surface and the bottom (glass plate) surface of the film. Statement-1: When light reflects from the air-glass plate interface, the reflected wave suffers a phase change of p. Statement-2: The centre of the interference pattern is dark.

picture

Direction: The question has a paragraph followed by two statements, Statement-1 and Statement-2. Of the given four alternatives after the statements, choose the one that describes the statements.

A thin air film is formed by putting the convex surface of a plane-convex lens over a plane glass plate. With monochromatic light, this film gives an interference pattern due to light reflected from the top (convex) surface and the bottom (glass plate) surface of the film.

Statement-1: When light reflects from the air-glass plate interface, the reflected wave suffers a phase change of p.

Statement-2: The centre of the interference pattern is dark.