Work, Energy and Power questions
712 published questions with worked solutions.
- If the linear momentum is increased by 50%, then the kinetic energy will be increased by [UP SEE 2008, K CET 2008]
- 10 L of water per second is lifted from a well through 20 m and delivered with a velocity of 10 ms⁻¹, then the power of the motor...
- Two bodies A and B have masses 20 kg and 5 kg respectively. Each one is acted upon by a force of 4 kg-wt. If they acquire the...
- A spring with spring constant k when stretched through 1 cm has potential energy U. If it is stretched by 4 cm, the potential...
- A rock of mass m is dropped to the ground from a height h. A second rock, with mass 2m, is dropped from the same height. When the...
- Power applied to a particle varies with time as P = (3t² − 2t + 1) W, where t is in second. Find the change in its kinetic energy...
- A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 ft tall building. After a fall of 30 ft each towards...
- A 16 kg block moving on a frictionless horizontal surface with a velocity of 4 m/s compresses an ideal spring and comes to rest....
- A particle is released from a height h. At a certain height, its KE is two times its potential energy. Height and speed of the...
- A ball dropped from a height of 2 m rebounds to a height of 1.5 m after hitting the ground. Then the percentage of energy lost is
- If the kinetic energy of a body is increased 2 times, its momentum will [RPET 2010]
- A body of mass 3 kg acted upon by a constant force is displaced by S metre, given by the relation S = ⅓t², where t is in second....
- A long spring is stretched by 2 cm and its potential energy is U. If the spring is stretched by 10 cm, its potential energy will...
- A block of mass m at the end of a string is whirled round in a vertical circle of radius r. The critical speed of the block at...
- When a spring is extended by 2 cm, energy stored is 100 J. When extended by a further 2 cm, the energy increases by
- A ball of mass 2 kg moving with velocity 3 ms⁻¹, collides with a spring of natural length 2 m and force constant 144 N m⁻¹. What...
- Consider the following statements A and B and identify the correct answer given below. [EAMCET 2003] (A) A body initially at rest...
- An engine pumps up 100 kg of water through a height of 10 m in 5 s. Given that the efficiency of the engine is 60%, if g = 10...
- A body of mass m accelerates uniformly from rest to v₁ in time t₁. The instantaneous power delivered to the body as a function of...
- A motor is used to deliver water at a certain rate through a given horizontal pipe. To deliver n-times the water through the same...
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