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प्रश्न
Give an example
Chemical energy changes to electrical energy.
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उत्तर
Dry cell
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संबंधित प्रश्न
A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
Name the force acting away from the centre of circular path.
What is the work done when the object acted upon by a force remains at rest?
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
How much energy is gained by a box of mass 20 kg when a man, runs carrying the box with a speed of 3 m/s-1 to catch the bus?
What are the advantages and disadvantages of using solar cells for producing electricity?
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
