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प्रश्न
Distinguish between work and power.
अंतर स्पष्ट करें
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उत्तर १
Work is said to be done only when the applied force on a body makes the body move but power is the rate of doing work.
The SI unit of work is 'joules' and that of power is 'watt'.
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उत्तर २
Work does not depend on time, while the power depends on time.
Power is the work done in unit time.
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संबंधित प्रश्न
The S.I. unit of work is
A boy throws a rubber ball vertically upwards. What type of work, positive or negative, is done : by the force applied by the boy?
(a) by the force applied by the boy?
(b) by the gravitational force of earth?
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?
What are the quantities on which the work done depends?
When you move upstairs, do you perform some work?
How is energy stored in a clock?
Write the S.I. units of power.
A horse exerts a pull on a cart of 300 N so that the horse-cart system moves with a uniform speed 18 km/h on a level road. Calculate the power developed by the horse in watt and also find its equivalent in horse power.
What is meant by the principle of moments?
A block of iron of mass 400 kg is used as a pile driver. If it is raised to a height of 20 meters, calculate the potential energy possessed by the iron block. (Assume g= 10 ms-2).
