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For a perfectly elastic collision, the coefficient of restitution $(e)$ is,

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Important Questions on Work, Energy and Power

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IMPORTANT

Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 2 - Work, Energy and Power>Practice Exercise>Q 13

A force of

5 N

acts through a distance

20 m

in the direction of motion. The work done is

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 2 - Work, Energy and Power>Practice Exercise>Q 15

Which one of the following diagrams illustrates the relation between kinetic energy

(K)

and the velocity

(v)

of a body?

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 2 - Work, Energy and Power>Practice Exercise>Q 16

Mass of

B

is four times that of

A

B

moves with a velocity half that of

A

. Then,

B

has

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 2 - Work, Energy and Power>Practice Exercise>Q 17

80 kg

man runs up a staircase of

4 m

8 s

. If the value of acceleration due to gravity is

10 m s^{- 2}

, then his average power output is

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 2 - Work, Energy and Power>Practice Exercise>Q 18

4 kg

mass and a

1 kg

mass are moving with equal kinetic energies. The ratio of their momenta is

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 2 - Work, Energy and Power>Practice Exercise>Q 19

The power output of a machine that lifts a

600 kg

weight through a height of

20 m

1 \min

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 2 - Work, Energy and Power>Practice Exercise>Q 20

A small ball is released from a height $H$ as shown in the figure in a vertical circular track, so that it loops inside of the circular track of radius $R$ . The value of $H$ must be

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 2 - Work, Energy and Power>Practice Exercise>Q 22

A unloaded car moving with velocity

u

on a frictionless road can be stopped in a distance

s

. If the passengers add

40 %

to its weight and breaking force remains the same, then the stopping distance at velocity

u

is now

For a perfectly elastic collision, the coefficient of restitution e is,

Important Questions on Work, Energy and Power

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For a perfectly elastic collision, the coefficient of restitution $(e)$ is,