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संबंधित प्रश्न
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 do you understand by the kinetic energy of a body?
A body of mass m is moving with a velocity v. Write the expression for its kinetic energy.
Name the form of energy in which potential energy can change.
Write the type of energy possessed in the following case:
A falling apple
Explain the principle of working of the windmill for generating electricity.
State the energy changes which take place when:
A car moves up a hill.
Give one example when:
Heat energy changes to kinetic energy.
Two bodies, A and B of equal mass are kept at heights 20 m and 30 m respectively. Calculate the ratio of their potential energies.
In a hydroelectric power station, 1000 kg of water is allowed to drop through a height of 100 m in 1 sec. If the conversion of potential energy to electric energy is 60%. Calculate the power output. [Take: g = 10m/sec2]
