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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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Medium
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Analyzing
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Assertion: A car moving on a horizontal road may be thrown out of the road in taking a turn due to lack of proper centripetal force.
Reason: If a particle moves in a circle, describing equal angles in equal intervals of time. Then the velocity vector changes its magnitude.
Reason: If a particle moves in a circle, describing equal angles in equal intervals of time. Then the velocity vector changes its magnitude.
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Correct option: C
If Assertion is True but the Reason is False
Option C (If Assertion is True but the Reason is False) is correct. The car can be thrown off due to lack of centripetal force, but the reason about velocity vector changing magnitude in uniform circular motion is false.
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A ball throwing cannon, lifts ball and throws with Speed. If balls are raised upto . then find Input power of cannon if it lifts 8 balls per minute and its efficiency is . Mass of each ball is .
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? 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.