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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

Power P= ............ /time taken.

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प्रश्न

Power P= ............ /time taken.

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उत्तर

Power P = work done/time taken.

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पाठ 4: Energy - Objective questions [पृष्ठ ७६]

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सेलिना Concise Physics [English] Class 8 ICSE
पाठ 4 Energy
Objective questions | Q 2.08 | पृष्ठ ७६

संबंधित प्रश्‍न

A body is moving unidirectionally under the influence of a source of constant power. Its displacement in time t is proportional to ______.


A family uses 8 kW of power.

  1. Direct solar energy is incident on the horizontal surface at an average rate of 200 W per square meter. If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8 kW?
  2. Compare this area to that of the roof of a typical house.

Rajan exerts a force of 150 N in pulling a cart at a constant speed of 10 m/s-1. Calculate the power exerted.


It takes 20 s for a girl A to climb up the stairs while girl B takes 15 s for the same job. Compare the power spent by then.


If a 1200 W electric iron is used daily for 30 minutes, how much total electricity is consumed in the month of April?


A wind-powered generator converts wind energy into electric energy. Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades into electrical energy. For wind speed v, the electrical power output will be proportional to ______


A ball with a velocity of 5 ms−1 impinges at an angle of 60˚ with the vertical on a smooth horizontal plane. If the coefficient of restitution is 0.5, find the velocity and direction after the impact.


An engine develops 20 kW power. How much time will it take to lift a mass of 200 kg to a height of 50 m? (g = 10 m/s2)


Calculate the power spent by a crane while lifting a load of mass 2000 kg, at velocity of 1.5 ms-1. (g = 10 ms-2)


Name the quantity which is measured in kW.


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