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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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Medium
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Analyzing
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This question has statement I and statement II. Of the four choices given after the statements, choose the one that best describes the two statements. If two springs and of the force constants and , respectively, are stretched by the same force, it is found that more work is done on spring than on spring .
Statement-I: If stretched by the same amount, work done on , will be more than that of
Statement-II :
Statement-I: If stretched by the same amount, work done on , will be more than that of
Statement-II :
View answer and explanation
Correct option: C
Statement-I is false, Statement-II is true
Option C is correct because Statement-I is false and Statement-II is true. More work is done on the spring with the smaller spring constant when stretched by the same 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.
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.