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

Anonymous User Physics 29 Jul, 2020 1 Answer 66 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 ${v}_{0}$ from the surface of the earth.The motion of the ball is affected by a drag force equal to $m\gamma {v}^{2}$ (where m is mass of the ball, v is the instantaneous velocity and $\gamma$ is constant).Time taken by the ball to rise to its zenith is?

Anonymous User Physics 26 Jul, 2020 1 Answer 95 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

Anonymous User Physics Gravitation and Projectile 25 Jul, 2020 1 Answer 58 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

Anonymous User Physics Circular and Rotational Motion 25 Jul, 2020 1 Answer 55 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

Anonymous User Physics Circular and Rotational Motion 25 Jul, 2020 1 Answer 54 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

Anonymous User Physics Circular and Rotational Motion 25 Jul, 2020 1 Answer 57 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.

Anonymous User Physics Circular and Rotational Motion 25 Jul, 2020 1 Answer 56 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 Physics 24 Jul, 2020 1 Answer 68 views

What is a escape velocity and its Expression.Explain?

Anonymous User Physics 24 Jul, 2020 1 Answer 59 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 Physics 24 Jul, 2020 0 Answer 57 views

Let P = (–1, 0), Q = (0, 0) and R = be three points. What is the equation of the bisector of the angle PQR?

Anonymous User Maths Two Dimensional Geometry 24 Jul, 2020 1 Answer 56 views

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

Anonymous User Physics Circular and Rotational Motion 24 Jul, 2020 1 Answer 55 views

Let A(h, k), B(1, 1) and C(2, 1) be the vertices of a right-angled triangle with AC as its hypotenuse. If the area of the triangle is 1 square unit, then the set of values which ‘k’ can take is given by

Anonymous User Maths Two Dimensional Geometry 24 Jul, 2020 1 Answer 60 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?

Anonymous User Physics 23 Jul, 2020 1 Answer 65 views

The equation of a tangent to the parabola y² = 8x is y = x + 2. The point on this line from which the other tangent to the parabola is perpendicular to the given tangent is

Anonymous User Maths Two Dimensional Geometry 22 Jul, 2020 1 Answer 55 views

For the Hyperbola which of the following remains constant when a varies?

Anonymous User Maths Two Dimensional Geometry 22 Jul, 2020 1 Answer 54 views

If (a, a²) falls inside the angle made by the lines, y = x/2, x > 0 and y = 3x, x > 0, then a belongs to

Anonymous User Maths Two Dimensional Geometry 22 Jul, 2020 1 Answer 54 views

Let C be the circle with centre (0, 0) and radius 3 units. The equation of the locus of the mid points of chord of the circle C that subtend an angle of at its centre is

Anonymous User Maths Two Dimensional Geometry 22 Jul, 2020 1 Answer 55 views

If the lines 3x – 4y – 7 = 0 and 2x – 3y – 5 = 0 are two diameters of a circle of area square units, then what will be the equation of the circle?

Anonymous User Maths Two Dimensional Geometry 22 Jul, 2020 1 Answer 54 views

If the pair of lines ax² + 2(a + b)xy + by² = 0 lie along diameters of a circle and divide the circle into four sectors such that the area of one of the sectors is thrice the area of another sector then

Anonymous User Maths Two Dimensional Geometry 21 Jul, 2020 1 Answer 54 views

The locus of a point moving under the condition that the line is a tangent to the hyperbola is

Anonymous User Maths Two Dimensional Geometry 21 Jul, 2020 1 Answer 50 views

An ellipse has OB as semi-minor axis, F and F' its focii and the angle FBF' is a right angle. Then what will be the eccentricity of the ellipse?

Anonymous User Maths Two Dimensional Geometry 21 Jul, 2020 1 Answer 52 views

If a circle passes through the point (a, b) and cuts the circle x² + y² = p² orthogonally, then the equation of the locus of its centre is

Anonymous User Maths Two Dimensional Geometry 21 Jul, 2020 1 Answer 52 views

A circle touches the x-axis and also touches the circle with centre at (0, 3) and radius 2. What will be the locus of the centre of the circle?

Anonymous User Maths Two Dimensional Geometry 21 Jul, 2020 1 Answer 54 views

Question & Answer

The locus of the vertices of the family of parabolas is

A straight line through the point A(3, 4) is such that its intercept between the axes is bisected at A. Its equation is,

If the pair of lines ax2 + 2(a + b)xy + by2 = 0 lie along diameters of a circle and divide the circle into four sectors such that the area of one of the sectors is thrice the area of another sector then

The locus of a point moving under the condition that the line is a tangent to the hyperbola is

An ellipse has OB as semi-minor axis, F and F' its focii and the angle FBF' is a right angle. Then what will be the eccentricity of the ellipse?

If a circle passes through the point (a, b) and cuts the circle x2 + y2 = p2 orthogonally, then the equation of the locus of its centre is

A circle touches the x­-axis and also touches the circle with centre at (0, 3) and radius 2. What will be the locus of the centre of the circle?

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 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?

If the circles x2 + y2 + 2ax + cy + a = 0 and x2 + y2 – 3ax + dy – 1 = 0 intersect in two distinct points P and Q then the line 5x+by – a = 0 passes through P and Q for

If a vertex of a triangle is (1, 1) and the midpoints of two sides through this vertex are (–1, 2) and (3, 2), then what will be the centroid of the triangle.

If non ­zero numbers a, b, c are in H.P., then the straight line always passes through a fixed point. That point is

The line parallel to thex­axis and passing through the intersection of the lines ax + 2by + 3b = 0 and bx – 2ay – 3a = 0, where (a, b) (0, 0) is

Let P be the point (1, 0) and Q a point on the locus y2 = 8x. The locus of midpoint of PQ is

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

. Metallic gold crystalises in face centred cubic lattice , Its edge length is 408 pm. What is the radius of gold atom

The given electric Network is equivalent to?

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.

A is more solluble than B in same solution if it undergoes cystalisation what solution will crystalise faster?

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?

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?

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 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 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 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 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 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 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.

What is a escape velocity and its Expression.Explain?

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

Let P = (–1, 0), Q = (0, 0) and R = be three points. What is the equation of the bisector of the angle PQR?

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

Let A(h, k), B(1, 1) and C(2, 1) be the vertices of a right-angled triangle with AC as its hypotenuse. If the area of the triangle is 1 square unit, then the set of values which ‘k’ can take is given by

The angular momentum of a system of particles is conserved

What is Work - Energy Principle? Please explain.

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 equation of a tangent to the parabola y2 = 8x is y = x + 2. The point on this line from which the other tangent to the parabola is perpendicular to the given tangent is

For the Hyperbola which of the following remains constant when a varies?

If (a, a2) falls inside the angle made by the lines, y = x/2, x > 0 and y = 3x, x > 0, then a belongs to

Let C be the circle with centre (0, 0) and radius 3 units. The equation of the locus of the mid points of chord of the circle C that subtend an angle of at its centre is

If the lines 3x – 4y – 7 = 0 and 2x – 3y – 5 = 0 are two diameters of a circle of area square units, then what will be the equation of the circle?

In an ellipse, the distance between its focii is 6 and the minor axis is 8. Then its eccentricity is,

The locus of the vertices of the family of parabolas is

A straight line through the point A(3, 4) is such that its intercept between the axes is bisected at A. Its equation is,

If the pair of lines ax2 + 2(a + b)xy + by2 = 0 lie along diameters of a circle and divide the circle into four sectors such that the area of one of the sectors is thrice the area of another sector then

The locus of a point moving under the condition that the line is a tangent to the hyperbola is

An ellipse has OB as semi-minor axis, F and F' its focii and the angle FBF' is a right angle. Then what will be the eccentricity of the ellipse?

If a circle passes through the point (a, b) and cuts the circle x2 + y2 = p2 orthogonally, then the equation of the locus of its centre is

A circle touches the x­-axis and also touches the circle with centre at (0, 3) and radius 2. What will be the locus of the centre of the circle?

If the pair of lines ax² + 2(a + b)xy + by² = 0 lie along diameters of a circle and divide the circle into four sectors such that the area of one of the sectors is thrice the area of another sector then

If a circle passes through the point (a, b) and cuts the circle x² + y² = p² orthogonally, then the equation of the locus of its centre is

A circle touches the x-axis and also touches the circle with centre at (0, 3) and radius 2. What will be the locus of the centre of the circle?

If the circles x² + y² + 2ax + cy + a = 0 and x² + y² – 3ax + dy – 1 = 0 intersect in two distinct points P and Q then the line 5x+by – a = 0 passes through P and Q for

If non zero numbers a, b, c are in H.P., then the straight line always passes through a fixed point. That point is

The line parallel to thexaxis and passing through the intersection of the lines ax + 2by + 3b = 0 and bx – 2ay – 3a = 0, where (a, b) (0, 0) is

The equation of a tangent to the parabola y² = 8x is y = x + 2. The point on this line from which the other tangent to the parabola is perpendicular to the given tangent is

If (a, a²) falls inside the angle made by the lines, y = x/2, x > 0 and y = 3x, x > 0, then a belongs to

If the pair of lines ax² + 2(a + b)xy + by² = 0 lie along diameters of a circle and divide the circle into four sectors such that the area of one of the sectors is thrice the area of another sector then

If a circle passes through the point (a, b) and cuts the circle x² + y² = p² orthogonally, then the equation of the locus of its centre is

A circle touches the x-axis and also touches the circle with centre at (0, 3) and radius 2. What will be the locus of the centre of the circle?