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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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A spring of constant is stretched by applying equal forces each of magnitude at the two ends. The energy stored in the spring is . Now, spring is cut into two equal parts and one of the part is stretched by applying equal forces each of magnitude at the two ends. The energy stored is
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Correct option: B
Option B () is correct because when the spring is cut in half, the spring constant doubles, and the energy stored is halved when the same force is applied.
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Assertion:When a particle moves in a circle with a uniform speed its acceleration is constant but the velocity changes.
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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.
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.