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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
Which of the following produces more heat (per unit mass) on burning?
Select the correct alternatives
The energy stored in an electric cell is
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?
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 three non-renewable sources of energy.
How is kinetic energy possessed by a moving body measured?
Obtain an expression for the potential energy of a body of mass m at a height h above the ground.
What is dissipation of energy?
What is the main energy transformation that occur in:
Charging of a battery.
Energy from various sources is considered to have been derived from the sun. Do you agree? Justify your answer.
