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प्रश्न
What are the uses of mechanical energy?
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उत्तर
- In hydroelectric plants, the kinetic energy of water is converted into electrical energy.
- Windmills convert the kinetic energy of winds into electrical energy.
- The mechanical energy of the hammer is used to apply a force to a nail.
- Mechanical energy can bring a moving body to rest and make a body at rest move.
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संबंधित प्रश्न
A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?
Kinetic energy = 1/2 × mass × ............
If the speed of a car is halved, how does its kinetic energy change?
A body of mass 10 kg is moving with a velocity 20 m s-1. If the mass of the body is doubled and its velocity is halved, find:
- the initial kinetic energy, and
- the final kinetic energy.
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
Which would have a greater effect on the kinetic energy of an object : doubling the mass or doubling the velocity?
On a level road, a scooterist applies brakes to slow down from a speed of 10 m/s to 5 m/s. If the mass of the scooterist and the scooter be 150 kg, calculate the work done by the brakes. (Neglect air resistance and friction)
A car is accelerated on a levelled road and attains a speed of 4 times its initial speed. In this process, the kinetic energy of the car :
If an object has 0 momentum, does it have kinetic energy? Explain your answer.
A body starts from rest and is acted on by a constant force. The ratio of kinetic energy gained by it in the first five seconds to that gained in the next five-second is:
