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प्रश्न
State the energy changes which take place when:
Water freezes in the freezing chamber of a fridge.
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उत्तर
The kinetic energy of water molecules is released in the form of heat energy.
संबंधित प्रश्न
State different forms of potential energy and give one example of each.
A light mass and a heavy mass have equal momentum. Which will have more kinetic energy?
(Hint : Kinetic energy K = P2/2m where P is the momentum.)
Name five renewable sources of energy.
What is a solar cell?
State two advantages of using wind energy for generating electricity.
What do you understand by the potential energy of the body?
How is kinetic energy possessed by a moving body measured?
Is it possible that a body may possess energy even when it is not in motion?
A body of mass 50 kg has a momentum of 3000 kg−1 ms. Calculate:
(j) the kinetic energy of the body.
(ii) the velocity of the body.
What ts the original source of energy for the electricity produced at a thermal power station?
