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JEE PHYSICS MCQ: WORK-ENERGY-POWER
1
Medium
1 of 1
Understanding
+4 | -1
You lift a suitcase from the floor and keep it on table. The work done by you on the suitcase does not depend on
a. The path taken by the suitcase
b. The time taken by you in doing so
c. The weight of the suitcase
d. Your weight
a. The path taken by the suitcase
b. The time taken by you in doing so
c. The weight of the suitcase
d. Your weight
View answer and explanation
Correct option: A
a, b d are correct
Option A (a, b & d) is correct because work done by you on the suitcase depends on the weight of the suitcase and the height it is lifted, but not on the path taken, the time taken, or your weight.
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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.