Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 1

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If the magnitude of two vectors are 8 unit and 5 unit and their scalar product is zero, the angle between the two vectors 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 2

In which of the following figures the work done by force

F

in displacing an object through distance

d

is positive? (

(θ

is the angle between

F

and

d)

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 3

The figure given below shows the force $F$ versus displacement $x$ graph. The net work done by the force when an object is displaced from $x = 0$ to $x = 16 m$ is

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

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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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