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प्रश्न
State two conditions for work to be done.
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उत्तर
The two conditions are:
(i) Application of-force on the body.
(ii) Displacement of the body in the direction of the force.
संबंधित प्रश्न
When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top but does not move or fall
1) Name the force exerted by the table top
2) What is the direction of the force?
A boy weighing 350 N climbs up 30 steps, each 20 cm high in 1 minute, Calculate:
- the work done and
- power spent.
Name the quality which is measured in kW.
What is meant by a rotatory motion? Give one example.
1 kWh = ______ J.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B of same mass does the same in 15 s. Compare the power developed by the persons A and B.
A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well, while his father does it in 2 minutes. Compare:
- the work, and
- power developed by them.
State the condition when the work done by the force is negative.
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person climbs a ladder.
