Name the quantity which is measured in Wh.

One Line Answer

Wh - Watt hour is measure of ENERGY.

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Chapter 2 Work, Energy and Power
EXERCISE - 2(A) | Q 30. (c) | Page 28

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

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

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?
What is the kinetic energy of the air?
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.

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Compare this area to that of the roof of a typical house.

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

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A pump raises water by spending 4×10⁵J of energy in 10s. Find the power of the pump.

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 .

An electric pump has 2 kW power. How much water will the pump lift every minute to a height of 10 m?

What is the minimum velocity with which a body of mass m must enter a vertical loop of radius R so that it can complete the loop?.

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)