Two billiard balls A and B, each of mass 50g and moving in opposite directions with a speed of 5 m/s each, collide and rebound at the same speed. If the collision lasts for 10-3 s,

(a) The impulse imparted to each ball is 0.25 kgms1 and the force on each ball is 250 N

(b) The impulse imparted to each ball is 0.25 kgms1 and the force exerted on each ball is 25 x 10-N

(c) The impulse imparted to each ball is 0.5 N-s

(d) The impulse and the force on each ball are equal in magnitude and opposite in direction.

Which of the following statement(s) is/are true?

1. (a, c)

2. (a, b)

3. (c, d)

4. (b, c)

Subtopic:  Collisions |
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A body is moving unidirectionally under the influence of a source of constant power supplying energy. Which of the diagrams shown in the figure correctly shown the displacement-time curve for its motion?

1. 2.  
3. 4.

Subtopic:  Power |
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Which of the diagrams shown in the figure most closely shows the variation in kinetic energy of the earth as it moves once around the sun in its elliptical orbit?

1. 2.
3. 4.
Subtopic:  Conservation of Mechanical Energy |
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Which of the diagrams shown in the figure represents the variation of to mechanical energy of a pendulum oscillating in the air as a function of time.
 

1. 2.
3. 4.
Subtopic:  Work Energy Theorem |
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A mass of 5 kg is moving along a circular path of radius 1 m. If the mas moves with 300 rev/min, its kinetic energy would be
 

1. 250π2

2. 100π2

3. 5π2

4. 0

Subtopic:  Concept of Work |
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A raindrop falling from a height h above ground attains a near-terminal velocity when it has fallen through a height (3/4)h. Which of the diagrams shown in the figure correctly shows the change in kinetic and potential energy of the drop during its fall up to the ground?
1. 2.
3. 4.  
Subtopic:  Work Energy Theorem |
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In a shotput event, an athlete throws the shotput of mass 10 kg with an initial speed of 1 m/s at 450 from a height 1.5 m above ground. Assuming air resistance to be negligible and acceleration due to gravity to be 10 m/s2, the kinetic energy of the shotput when it just reaches the ground will be:

1. 2.5 J

2. 5.0 J

3. 52.5 J

4. 155.0 J

Subtopic:  Work Energy Theorem |
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Which of the diagrams in the figure correctly shows the change in kinetic energy of an iron sphere falling freely in a lake having sufficient density to impart it a terminal velocity?

1. 2.
3. 4.
Subtopic:  Concept of Work | Work Energy Theorem |
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A cricket ball of mass 150 g moving with a speed of 126 km/h hits at the middle of the bat, held firmly at its position by the batsman. The ball moves straight back to the bowler after hitting the bat. Assuming that collision between ball and bat is completely elastic and the two remains in contact for 0.001s, the force that the batsman had to apply to hold the bat firmly at its place would be

1. 10.5 N   
2. 21 N   
3. 1.05 x 104 N   
4. 2.1 x 104 N

Subtopic:  Collisions |
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A man of mass m, standing at the bottom of the staircase, of height L, climbs it and stands at its top.

(a) Work done by all forces on man is equal to the rise in energy mgL.
(b) Work done by all forces on man is zero.
(c) Work done by the gravitational force on man is mgL.
(d) The reaction force from a step does not do work because the point of the application of the force does not move while the force exists.

Choose the correct option:

1. (a, d)

2. (a, c)

3. (b, d)

4. (a, b, c)

Subtopic:  Concept of Work | Work Energy Theorem |
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