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प्रश्न
Name the forms of energy which a wound-up watch spring possesses.
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उत्तर
Elastic potential energy is possessed by wound up watch spring
संबंधित प्रश्न
When do we say that work is done?
Name a common device where a gear train is used
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.
Express joule in terms of erg.
What do you mean by degradation of energy?
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
Choose one or more correct alternatives.
For work to be performed, energy must be ______.
- transferred from one place to another
- concentrated
- transformed from one type to another
- destroyed
An electric motor drives a machine which lifts a mass of 4 kg through a height of 10 m in 5 s at a constant speed. Assuming g = 10 ms-2, calculate
(i) the amount of work done, (ii) the power of the machine.
Name the CGS unit of work.
