Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 4

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A bullet having mass $10 g$ is fired towards a fixed wooden block with velocity of $30 m s^{- 1} .$ If it comes out of the block with velocity of $20 m s^{- 1},$ then the total work done by the resistive forces is

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Important Questions on Work, Energy and Power

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 5

A force

\vec{F} = (3 \hat{i} + 4 \hat{j} + 5 \hat{k}) N

acts on an object and displaces it through

\vec{d} = 5 \hat{k} m .

The total work done by the force in this process is

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 7

Two balls, one of mass

m

and other of mass

2 m

are moving towards each other with respective speeds of

10 m s^{- 1}

and

20 m s^{- 1}

on a smooth horizontal floor. If after collision they stick to each other and move as combined mass (perfectly inelastic collision), then the speed of combined mass will be

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 9

A ball is dropped from

100 m

and it rebounds to a height of

70 m .

The percentage loss of energy is

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 10

Magnitude of a moving body has kinetic energy twice its momentum. The speed of the body is

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 11

A body of mass

1 kg

is moving with velocity of

(3 \hat{i} + 4 \hat{j}) m s^{- 1} .

The kinetic energy possessed by it will be

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 12

The figure below shows a fixed smooth incline plane having slope length $I,$ height $h$ and base length $b .$ It is attached to a smooth horizontal ground. A block of mass $m$ is released from top of a plane. On reaching the bottom of incline plane, the kinetic energy possessed by it is

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