Work, Energy an...

What is the velocity of the bob of a simple pendulum at its mean position, if it is able to rise to vertical height of 10 cm? (Take g = 9.8 m/s²)

A particle of mass ‘m’ and charge ‘q’ is accelerated through a potential difference of ‘V volt, its energy is

If a body looses half of its velocity on penetrating 3 cm in a wooden block, then how much will it penetrate more before coming to rest?

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

A particle of mass m at rest is acted upon by a force F for a time t. Its kinetic energy after an interval t is

The potential energy of a weight less spring compressed by a distance a is proportional to

A simple pendulum is released from A as shown. If m and l represent the mass of the bob and length of the pendulum, the gain in kinetic energy at B is

A 2 kg block slides on a horizontal floor with a speed of 4 m/s. It strikes an uncompressed spring and compresses it till the block is motionless. The kinetic friction force is 1.5 N and spring constant is 10,000 N/m. The spring compresses by

A bullet moving with a speed of 100 ms^–1 can just penetrate two planks of equal thickness. Then, the number of such planks penetrated by the same bullet when the speed is doubled will be

If momentum is increased by 20%, then kinetic energy increases by