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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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Find out the power of an engine which can draw a train of ' 400 ' metric ton up the inclined plane of 1 in 98 at the rate . The resistance due to friction acting on the train is ' 10 ' per ton.
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Correct option: C
440 KW
Option C (440 KW) is correct because the power is calculated considering both the inclined plane and the friction force.
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Reason: Angular displacement is not an axial vector. A body of mass thrown vertically upwards attains a maximum height . As what height will its kinetic energy be 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 moving at a speed hits a ball of mass kept at rest. A small part having mass breaks from the ball and sticks to the bullet. The remaining ball is found to move at a speed in the direction of the bullet. Find the velocity of the bullet after the collision.