JEE PHYSICS MCQ: WORK-ENERGY-POWER

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Power delivered to a particle varies with time as

P=\left(3 t^2-2 t\right)

watt, where '

t

' is in seconds, then change in its kinetic energy between time

t=1

t=3 \mathrm{~s}

View answer and explanation

Correct option: A

18 \mathrm{~J}

Option A (

18 \mathrm{~J}

) is correct because it is the result of integrating the power function with respect to time between the given limits, representing the work done and thus the change in kinetic energy.

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10 \mathrm{~m}

. then find Input power of cannon if it lifts 8 balls per minute and its efficiency is

80 \%

. Mass of each ball is

1 \mathrm{~kg}

. Assertion:When a particle moves in a circle with a uniform speed its acceleration is constant but the velocity changes.
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. As what height will its kinetic energy be

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of its initial value? Assertion: Centripetal force does no work.

Reason: Force and displacement are perpendicular to each other. Statement I: Both stretched and compressed springs possess potential energy.

Statement II: Work done against restoring force is stored as potential energy. A bullet of mass

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hits a ball of mass

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kept at rest. A small part having mass

m^{\prime}

breaks from the ball and sticks to the bullet. The remaining ball is found to move at a speed

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