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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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Three identical cars and are moving at the same speed on three bridges. The car goes on a plane bridge on a bridge convex upwards and goes on a bridge concave upwards. Let and be the normal forces exerted by the cars on the bridges when they are at the middle of the bridges. Then
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Correct option: C
is maximum of the three forces
Option C ( is maximum of the three forces) is correct because the normal force on the concave bridge is greater than the weight, while on the convex bridge it is less, and on the plane bridge it equals the weight.
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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.