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प्रश्न
Name the type of energy (kinetic energy K or potential energy U) possessed in the given cases:
A compressed spring
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उत्तर
Potential energy (U)
संबंधित प्रश्न
Fill in the blank
The energy possessed by a body due to its motion is called ______ energy.
A body of mass m is moving with a velocity v. Write the expression for its kinetic energy.
What is a solar cell?
State the energy transformation on the following:
Electricity is obtained from hydro energy.
A hydroelectric power station takes its water from a lake whose water level is 50 m above the turbine. Assuming an overall efficiency of 40%, calculate the mass of water which must flow through the turbine each second to produce power output of 1 MW. (Take g = 10 m s−2).
What happens to the K.E. when
(i) the mass of the body is doubled at a constant velocity and
(ii) the velocity of the body is doubled at constant mass?
State the energy changes which take place when:
Food is digested by animals.
Give one example when:
Sound energy changes to electric energy.
Show that in case of a body falling freely under gravity, total mechanical energy remains conserved (neglect air resistance).
What is nuclear energy? Explain the principle of producing electricity using nuclear energy is a nuclear reactor.
