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प्रश्न
State the energy changes which take place when:
Food is digested by animals.
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उत्तर
The chemical energy changes into heat energy.
संबंधित प्रश्न
(i) The conversion of part of the energy into an undesirable form is called ______________.
(ii) For a given height h, __________________ the length l of the inclined plane, lesser will be the effort required.
Explain how, geothermal energy is used to generate electricity.
State two advantages of geothermal energy.
A cyclist doubles his speed. How will his kinetic energy change: increase, decrease or remain same ?
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?
What kind of energy is possessed in a situation when?
A shooting arrow.
Give three examples of bodies possessing potential energy.
State the energy changes which take place when:
A toy car spring is wound and car is made to run on level floor.
For the same kinetic energy of a body, what should be the change in its velocity if its mass is increased nine times?
