Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 1

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A nuclear reactor delivers a power of $10 W$ . Find fuel consumed by the reactor per hour, if its efficiency is $20 %$ .

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Important Questions on Work, Energy and Power

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 2

A ball of mass

0.2 k g

falls from the ceiling of an elevator moving down with a uniform speed of

5 m s^{- 1}

. It hits the floor of the elevator (length of the elevator =

5 m

) and does not rebound. The amount of heat produced by the impact is (Take

g = 10 m s^{- 2}

)

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 1

A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time $t$ is proportional to

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 2

The power of a water jet flowing through an orifice of radius

r

with velocity

v

is

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 3

A body is moved along a straight line by machine delivering a constant power. The distance moved by the body in time

t

is proportional to

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 4

Ten litre of water per second is lifted from well through

20 m

and delivered with a velocity of

10 m s^{- 1}

, then the power of the motor is

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 5

Power applied to particle varies with time as

p = (3 t^{2} - 2 t + 1) W

,where t is in second. Find the change in its kinetic energy between t=2s and t=4s

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 6

An electric pump is used to fill an overhead tank of capacity 9

m^{3}

kept at a height of 10 m above the ground .If the pump takes 5 min to fill the tank by consuming 10 KW .power the efficiency of the pump should be (Take g=10

m s^{- 2}

)

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 7

A particle moves with a velocity

(5 \hat{i} - 3 \hat{j} + 6 \hat{k}) {m s}^{- 1}

under the influence of a constant force

\vec{F} = (10 \hat{i} - 10 \hat{j} + 20 \hat{k}) N.

The instantaneous power applied to the particle is