Work Energy
Practice Work Energy MCQs from Physics — Science.
What is the work done by friction on a body of mass m sliding down an inclined plane of length L and inclination angle theta?
The energy equivalent of 1 amu (atomic mass unit) is approximately:
If air resistance is not negligible, the total mechanical energy of a falling body:
A bullet loses 1/20th of its velocity in passing through a plank. What is the minimum number of such planks required to stop the bullet?
A ball of mass m is dropped from height h. It rebounds to height h1. The energy lost is:
A human heart discharges 75 cc of blood at each beat against a pressure of 0.1 m of Hg. If the pulse rate is 80 per minute, the power of the heart is (density of Hg=13.6g/cc):
A wire is stretched by 1 mm by a force of 1 kN. The work done in stretching is:
The work done to rotate a dipole in an electric field depends on:
If a body moves with a velocity v and an acceleration a, the power P delivered by the force is:
A body of mass 10 kg is pushed with a force of 50 N up an inclined plane of 30 degrees for 10 m. Work done by the force is:
Which law states that energy can neither be created nor destroyed?
What is the power of a bulb that consumes 1000 J in 5 seconds?
A boy of mass 50 kg climbs a tree 5 m high. The work done by him is (g=10):
If the distance is doubled for a constant force, the work done is: