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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

Power P= ............ /time taken. - Physics

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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

The blades of a windmill sweep out a circle of area A.

  1. If the wind flows at a velocity v perpendicular to the circle, what is the mass of the air passing through it in time t?
  2. What is the kinetic energy of the air?
  3. Assume that the windmill converts 25% of the wind’s energy into electrical energy, and that A = 30 m2, v = 36 km/h and the density of air is 1.2 kg m–3. What is the electrical power produced?

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.

Match the following

column A Column B
A stone at a height power 
A Moving ball   joule
Energy work done in 1 s
 Power potential energy 
Watt kinetic energy 

1 H.P. is equal to


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 work done .


Two equal masses m1 and m2 are moving along the same straight line with velocities 5 ms-1 and -9 ms-1 respectively. If the collision is elastic, then calculate the velocities after the collision of m1 and m2, respectively.


Arrive at an expression for power and velocity. Give some examples for the same.


Sand is being dropped from a stationary dropper at a rate of 0.5 kgs-1 on a conveyor belt moving with a velocity of 5 ms-1. The power needed to keep belt moving with the same velocity will be ______.


Name the quantity which is measured in kWh.


Name the quantity which is measured in Wh.


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