Work, Energy and Power questions
712 published questions with worked solutions.
- A kathak dancer is standing on horizontal surface with folded hands. In the begining dancer is rotating about his central axis...
- A weightless thread can bear tension up to 3.7 kg wt. A stone of mass 500 gram is tied to it and revolved in circular path of...
- A charged particle of mass 'm' and charge 'q' is at rest. It is accelerated in a uniform electric field of intensity 'E' for time...
- A stone of mass 1 kg tied to a light inextensible string of length L = 5 3 m is rotating in a circular path of radius L in a...
- The spring is initially in unstretched condition. It is first stretched by a length 'x' and the work done is W_1. Then again it...
- A pendulum bob has a speed 4 m/s at its lowest position. The pendulum is 1 m long. When the length of the string makes an angle...
- A particle is displaced from point P (3m, 4m, 5m) to a point Q (2m, 3m, 4m) under a constant force F = (3 i + 4 j + 5 k ) N. The...
- A constant force F =3 i -2 j - k newton has a displacement r =2 i -3 j -3 k metre in 2 second. The work done and the power are...
- A stone of mass 'm' kg is tied to a string of length 'L' m and moved in a vertical circle of radius 49 cm in a vertical plane. If...
- A particle gets displaced by r = (2 i + 3 j + 4 k)m under the action of a force F = (7 i + 4 j + 3 k). The change in its kinetic...
- This question has statement 1 and statement 2. Of the four choices given after the statements, choose the one that best describes...
- A 70 kg man leaps vertically into the air from a crouching position. To take the leap the man pushes the ground with a constant...
- A wind-powered generator converts wind energy into electrical energy. Assume that the generator converts a fixed fraction of the...
- The average mass of rain drops is 3.0 10^ -5 kg and their average terminal velocity is 9 m/s. Calculate the energy transferred by...
- The power of a crane, which lifts a mass of 1000 kg to a height of 20 m in 10 s is: (g = 9.8 m/s ^2)
- A block of mass m = 0.1 kg is connected to a spring of unknown spring constant k. It is compressed to a distance x from its...
- A particle is moving in a circle of radius r under the action of a force F = r^2 which is directed towards centre of the circle....
- A car of weight W is on an inclined road that rises by 100 m over a distance of 1 km and applies a constant frictional force W 20...
- The velocity of a body of mass 20 kg decreases from 20 ms^ -1 to 5 ms^ -1 in a distance of 100 m. The force on the body is
- A bullet moving with a speed of 100 ms^ -1 can just penetrate two planks of equal thickness. Then, the number of such planks...
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