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JEE PHYSICS MCQ: WORK-ENERGY-POWER
1
Easy
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Understanding
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Assertion: Centripetal force does no work.
Reason: Force and displacement are perpendicular to each other.
Reason: Force and displacement are perpendicular to each other.
View answer and explanation
Correct option: A
If both assertion and reason are true and reason is the correct explanation of the assertion.
Option A is correct because centripetal force does no work as it is always perpendicular to the displacement, and the reason correctly explains this.
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Assertion:When a particle moves in a circle with a uniform speed its acceleration is constant but the velocity changes.
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? 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. A 2.0 kg block is dropped from a height of 40 cm onto a spring of spring constant . Find the maximum distance the spring is compressed
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? 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. A 2.0 kg block is dropped from a height of 40 cm onto a spring of spring constant . Find the maximum distance the spring is compressed