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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
An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.
Two toy-cars A and Bof masses 200 g and 500 g respectively are moving with the same speed. Which of the two has greater kinetic energy?
Give reasons for the following A horse and a dog are running with the same speed. Which one of them has more kinetic energy than the other.
A cannon ball of mass 500 g is fired with a speed of 15 m s-1. Find:
- its kinetic energy.
- its momentum.
How fast should a man of 50 kg run so that his kinetic energy be 625 J?
A ball of mass 200 g falls from a height of 5 metres. What is its kinetic energy when it just reaches the ground? (g = 9.8 m/s2)
Find out the form of energy possessed by the following thing.
Water falls
When a bell fixed on a cycle rings, then the energy conversion that takes place is ______.
If the mass as well as the velocity of a body is doubled then the kinetic energy of the body ______ the initial kinetic energy.
A ball of mass 0.5 kg slows down from a speed of 10 m s−1 to that of 6 m s−1. Calculate the change in the kinetic energy of the ball.
