A man weighing 500 N carries a load of 10 kg to the top of a building in 4 minutes. The work done by the man is 6 × 𝟏𝟎4 J. If he carries the same load in 8 minutes, the work done by the man will be:
Two bodies moving towards each other collide and move away in opposite directions. There is some rise in
temperature of bodies because a part of the kinetic energy is converted into
You lift a heavy book from the floor of the room and keep it in the book-shelf having a height 2 m. In this process
you take 5 seconds. The work done by you will depend upon:
An engine pumps up 100 kg of water through a height of 10m in 5s. Given that the efficiency of the engine is 60%, what is the power of the engine? (Take g = 10ms-2)
A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25
joules, the angle which the force makes with the direction of motion of the body is?
A man M1 of mass 80 kg runs up a staircase in 15s. Another man M2 also of mass 80 kg runs up the same staircase in 20s. The ratio of the power developed by them will be
