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प्रश्न
State two disadvantages of using wind energy for generating electricity.
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उत्तर
Disadvantages of using wind energy:
1. The establishment of a wind farm is expensive.
A large area of land is needed for the establishment of a wind farm.
संबंधित प्रश्न
State the changes in form of energy while producing hydro electricity.
Name the physical quantity measured in terms of horse power.
Select the renewable and non-renewable sources of energy from the following:
Diesel
State four ways for the judicious use of energy.
Name the energy changes for each of the following cases:
dynamo
A ball of mass 0.5 kg slows down from a speed of 5m/s-1 to that of 3m/s-1. Calculate the change in kinetic energy of the ball.
How is kinetic energy possessed by a moving body measured?
State the energy changes which take place when:
A stone projected vertically upwards, returns back to the thrower.
A ball of mass 50 g falls from a height of 2m and rebounds from the ground to 1.6 m. Find:
(i) The potential energy possessed by the ball when initially at rest.
(ii) The kinetic energy of the ball before it hits the ground.
(iii) The final potential energy of the ball.
(iv) The loss in kinetic energy of the ball on collision. (Take: g = 10N kg−1)
Unit of calorific value of a substance is ____________.
