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प्रश्न
Name the quality which is measured in kW.
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उत्तर
Power is measure in kW
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 body is moved in a direction opposite to the direction of force acting on it. State whether the work is done by the force or work is done against the force
When a body moves in a circular path, how much work is done by the body? Give reason.
(Hint: The body is acted upon by the centripetal force.)
Differentiate between work and power.
An engine does 54,000 J of work by exerting a force of 6000 N on it. What is the displacement in the direction of the force?
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.
How much work each does? Take density of water = 103 kg m-3 and g = 9.8 N kg-1.
State the S.I. and C.G.S. units of energy. How are they related?
A man weighing 700 N runs up a flight of 15 steps, each 20 cm high, in 5 seconds. Calculate the power of the man.
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person climbs a ladder.
A boy weighing 50 kgf climbs up from the first floor at a height of 3 m above the ground to the third floor at a height of 9 m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg-1).
