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प्रश्न
State the energy changes which take place when:
A car moves up a hill.
उत्तर
The kinetic energy of moving car changes to potential energy.
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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.
Geothermal energy is produced by the:
(a) fission of radioactive materials
(b) burning of coal inside the coal mines
(c) combustion of natural gas deep inside the earth
(d) fusion of radioactive substances
Select the renewable and non-renewable sources of energy from the following:
Water
What is ocean? Explain in brief.
Name the energy changes for the following
human body
A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The total energy possessed by the body at any instant? (Take g = 10 ms-2).
Name a device in which solar energy is converted into electricity state its two uses.
Explain the principle of working of the windmill for generating electricity.
Give one example when:
Chemical energy to electrical 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.
