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प्रश्न
A coolie does no work against the force of gravity while carrying a luggage on a road.
पर्याय
True
False
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उत्तर
True.
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संबंधित प्रश्न
When does a force perform work?
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
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
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
A car is running at a speed of 15 km h-1 while another similar car is moving at a speed of 45 km h-1. Find the ratio of their kinetic energies.
The work done on an object does not depend on the :
How many joules are there in 1 mega joule?
A body does 20 J of work in 10 s. What is its power?
Name two places in India where electricity is generated from nuclear power plants.
