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प्रश्न
State the S.I. unit of energy.
State the SI unit of electrical energy.
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उत्तर
Joule (J)
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संबंधित प्रश्न
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.
State the SI unit of work.
What are the units of (a) work, and (b) energy?
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
Explain by an example that a body may possess energy even when it is not in motion.
Complete the following sentences:
1 H.P. = ........ W.
A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i) work done by machine,
(ii) power at which the machine works.
In the following case write yes, if the work is being done and no if no work is being done.
A coolie standing with a heavy load on his head
In what way does an ‘Ideal machine’ differ from a ‘Practical machine’?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A donkey is carrying a load on its back.
Work done by this force at any instant is ______.
