Work, Energy and Power questions
712 published questions with worked solutions.
- The kinetic energy of a body is increased by 300%. What is the percentage increase in the momentum of the body?
- A car is moving with a speed of 100 km h⁻¹. If the mass of the car is 950 kg, then its kinetic energy is
- Given that the position of the body in metre is a function of time as follows: x = 2t⁴ + 5t + 4. The mass of the body is 2 kg....
- The potential energy of a particle of mass 5 kg moving in the x–y plane is given by U = (−7x+24y) J, x and y being in metre....
- A stone of mass 2 kg is projected upward with KE of 98 J. The height at which the KE of the body becomes half its original value...
- Two masses of 1 g and 4 g are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is
- An engine pumps water continuously through a hole. Speed with which water passes through the hole nozzle is v and k is the mass...
- A mass of 50 kg is raised through a certain height by a machine whose efficiency is 90%. The energy used is 5000 J. If the mass...
- A long spring, when stretched by x cm, has a potential energy U. On increasing the length of the spring by stretching it to nx...
- An engine of power 7500 W makes a train move on a horizontal surface with constant velocity of 20 ms⁻¹. The force involved in the...
- A car manufacturer claims that his car can be accelerated from rest to a velocity of 10 ms⁻¹ in 5 s. If the total mass of the car...
- A 500 kg car, moving with a velocity of 36 km h⁻¹ on a straight road unidirectionally, doubles its velocity in one minute. The...
- The power of a water pump is 2 kW. If g = 10 ms⁻², then the amount of water it can raise in 1 min to a height of 10 m is
- What power must a sprinter, of mass 80 kg, develop from the start if he has to impart a velocity of 10 ms⁻¹ to his body in 4 s?
- A body is moved along a straight line by a machine delivering a constant power. The distance moved by the body in time t is...
- A one kilowatt motor is used to pump water from a well 10 m deep. The quantity of water pumped out per second is nearly
- The power supplied by a force acting on a particle moving in a straight line is constant. The velocity of the particle varies...
- It is observed that the force required to tow a boat at a constant velocity is proportional to the velocity. It takes 16 HP to...
- An electric motor creates a tension of 9000 N in a hoisting cable and reels it in at the rate of 2 ms⁻¹. The power of the...
- The power of a water jet flowing through an orifice of radius r with velocity v is
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