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JEE PHYSICS MCQ: WORK-ENERGY-POWER
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Assertion: During horizontal circular turn of a car, the centripetal force required should be less than
the limiting friction between its tyres and road.
Reason: The centripetal force to car is provided by the frictional force between its tyres and road.
the limiting friction between its tyres and road.
Reason: The centripetal force to car is provided by the frictional force between its tyres and road.
View answer and explanation
Correct option: A
If both assertion and reason are true and the reason is the correct explanation of the assertion
Option A (If both assertion and reason are true and the reason is the correct explanation of the assertion) is correct because the centripetal force required for a car to turn is provided by friction, and this force must be less than the limiting friction.
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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.