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प्रश्न
State the energy transformation on the following:
Electricity is obtained from solar energy.
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उत्तर
Light energy into electrical energy
संबंधित प्रश्न
Define the term energy.
1 J = ______ calorie.
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
Can work done be zero even if force acts on the body?
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
Name the material commonly used for the manufacturing of solar cells.
A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform, 2.5 m above the ground.
(i) Calculate the mechanical advantage of the inclined plane. (ii) Calculate the effort applied by the coolie.
(iii) In actual practice, the coolie needs to apply more effort than what is calculated. Give one reason why you think the coolie needs to apply more effort.
