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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
Define the term kinetic energy. Give one example of a body which possesses kinetic energy.
If the speed of a car is halved, how does its kinetic energy change?
Two bodies of equal masses are moving with uniform velocities v and 2v. Find the ratio of their kinetic energies.
By how much will the kinetic energy of a body increase if its speed is doubled?
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 :
The momentum of a bullet of mass 20 g fired from a gun is 10 kg.m/s. The kinetic energy of this bullet in kJ will be :
Derive the formula for the kinetic energy of an object of mass m, moving with velocity v.
Find out the form of energy possessed by the following thing.
A rolling ball
An apple falling from a tree is an example for kinetic energy.
What is energy of motion? Give examples.
