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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.
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उत्तर
work being done in the following cases
(b) A boy climbing up the stairs
(d) A girl moving on the road.
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संबंधित प्रश्न
Work is said to be done by a forte only when ................
What is the condition for a force to do work on a body?
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
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.
Give an example
Electrical energy changes of sound energy.
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
