Work, Energy and Power questions
712 published questions with worked solutions.
- An electric pump is used to fill an overhead tank of capacity 9 m³ kept at a height of 10 m above the ground. If the pump takes 5...
- A force **F** = (2î + 4ĵ) N displaces a body by **s** = (3ĵ + 5k̂) m in 2 s. The power generated will be
- A machine gun fires 240 bullets per minute. If the mass of each bullet is 10 g and the velocity of the bullets is 600 ms⁻¹, the...
- A car of mass m is driven with an acceleration a along a straight level road against a constant external resistive force R. When...
- The height of the dam in a hydroelectric power station is 10 m. In order to generate 1 MW of electric power, the mass of water...
- A man does a given amount of work in 10 s. Another man does the same amount of work in 20 s. The ratio of the output power of the...
- A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time t...
- A body of mass M is moving with a uniform speed of 10 m/s on a frictionless surface under the influence of two forces F₁ and F₂....
- At t = 0 s a particle starts moving along the x-axis. If its kinetic energy increases uniformly with time t, the net force acting...
- If F is the force required to keep a train moving at a constant speed v, the power required is
- A body of mass 2 kg is projected at 20 ms⁻¹ at an angle 60° above the horizontal. The power due to the gravitational force at its...
- A box is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is...
- Statement 1: A spring has potential energy, whether it is compressed or stretched. Statement 2: In compressing or stretching,...
- Statement 1: According to the law of conservation of mechanical energy, the change in potential energy is equal and opposite to...
- Statement 1: If a light body and a heavy body have equal kinetic energies, momentum is greater for the heavy body. Statement 2:...
- A chain of mass M is placed on a smooth table with 1/3 of its length L hanging over the edge. The work done in pulling the chain...
- A car weighing 1400 kg is moving at a speed of 54 km/h up a hill when the motor stops. If it is just able to reach the...
- A bucket tied to a string is lowered at a constant acceleration of g/4. If the mass of the bucket is m and it is lowered by a...
- The velocity of a 2 kg body is changed from (4î + 3ĵ) ms⁻¹ to 6 ĵ ms⁻¹. The work done on the body is
- A man, by working a hand pump fixed to a well, pumps out 10 m³ of water in 1 s. If the water in the well is 10 m below ground...
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