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प्रश्न
Name the material commonly used for the manufacturing of solar cells.
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उत्तर
Silicon and Gallium. Solar cell produces d.c. current. State whether a solar cell produces a.c. or d.c. current.
संबंधित प्रश्न
A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B does the same in 15 s. Compare the work done.
A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate:
- the work done, and
- the power developed by him. Take g = 10 N kg-1
How many watts equal one horse power?
State the conditions of equilibrium for a rigid body.
On what factors does the work done by a force depend?
What should be the characteristic of a source of energy?
Work done by this force at any instant is ______.
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
