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प्रश्न
State the energy changes which take place when:
A toy car spring is wound and car is made to run on level floor.
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उत्तर
The mechanical energy changes to potential energy during winding. The potential energy is then released in the form of kinetic energy.
संबंधित प्रश्न
Give one example of a body that has potential energy, due to its position at a height.
A boy of mass m climbs up a staircase of vertical height h.
(a) What is the work done by the boy against the force of gravity?
(b) What would have been the work done if he uses a lift in climbing the same vertical height?
Write an expression for the potential energy of a body of mass m placed at a height h above the earth's surface. State the assumptions made, if any.
What is a solar cell?
State two disadvantages of producing electricity from solar energy.
How much electric power is generated in India using the wing energy?
A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground.
What the kinetic energy of the ball just before it hits the ground ?
Explain the principle of working of the windmill for generating electricity.
Give one example when:
Mechanical energy changes to electric energy.
Calculate the kinetic energy of a body of mass 0.1 kg. and momentum 40kg m/s.
