A body of mass m slides down an incline and reaches the bottom with a velocity v. If the same mass were in the form of a ring which rolls down this incline, the velocity of the ring at bottom would have been

(1) v

(2)  2 v

(3) 1/2v

(4) 2/5v

Concept Questions :-

Rolling motion
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A rod is released at an angle 45° to the horizontal as shown. If its length is L, its angular acceleration about its foot at ground is initially

1. 3g2L

2. 3g2L

3. 3g22L

4. 6g2L

Concept Questions :-

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From a disc of mass M and radius '2a', a concentric disc of radius 'a' is cut out. The moment of inertia of remaining disc is 

1.  Ma28  

2.  1516Ma2  

3.  78Ma2  

4.  32Ma2

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The moment of inertia of pulley is I and its radius is R. The string doesn't slips on the pulley, as system is released, the acceleration of the system is

(1) g3+ImR2

(2) g1+ImR2

(3) 3g1+ImR2

(4) 3g2+ImR2

Concept Questions :-

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A 100 g iron ball having velocity 10 m/s collides with a wall at an angle 30° and rebounds with the same angle. If the period of contact between the ball and wall is 0.1 second, then the force experienced by the wall is 

(1) 10 N

(2) 100 N

(3) 1.0 N

(4) 0.1 N

Concept Questions :-

Linear momentum
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A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards ?

(1) 0.1 m/s

(2) 10 m/s

(3) 1 m/s

(4) 0.01 m/s

Concept Questions :-

Linear momentum
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A body of mass M at rest explodes into three pieces, two of which of mass M/4 each are thrown off in perpendicular directions with velocities of 3 m/s and 4 m/s respectively. The third piece will be thrown off with a velocity of 

(1) 1.5 m/s

(2) 2.0 m/s

(3) 2.5 m/s

(4) 3.0 m/s

Concept Questions :-

Linear momentum
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In the figure given below, the position-time graph of a particle of mass 0.1 Kg is shown. The impulse at t = 2 sec is 

(1) 0.2 kg m sec–1

(2) –0.2 kg m sec–1

(3) 0.1 kg m sec–1

(4) –0.4 kg m sec–1

Concept Questions :-

Linear momentum
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A particle of mass m moving with velocity u makes an elastic one dimensional collision with a stationary particle of mass m. They are in contact for a very short time T. Their force of interaction increases from zero to F0 linearly in time T/2, and decreases linearly to zero in further time T/2. The magnitude of F0 is

(1) mu/T

(2) 4mu/T

(3) mu/2T

(4) None of these

Concept Questions :-

Linear momentum
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A force of 50 dynes is acted on a body of mass 5 g which acts for an interval of 3 seconds, then impulse is 

(1) 0.15 × 10–3 N-s

(2) 0.98 × 10–3 N-s

(3) 1.5 × 10–3 N-s

(4) 2.5 × 10–3 N-s

Concept Questions :-

Linear momentum
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