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प्रश्न
Can work done be zero even if force acts on the body?
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उत्तर
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संबंधित प्रश्न
Power spent by a body depends on the time for which it does 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.
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 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.
What are the units of (a) work, and (b) energy?
The velocity of a car increases from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Complete the following sentences:
1 H.P. = ........ W.
