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Work Energy And Power
Which physical quantity does this electronvolt measure? How is it related to the S.I. unit of this quantity?
Electronvolt measures energy.
It is related to the S.I. unit of enrgy joule as 1 eV = 1.6 x 10-19 J.
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How is work done by a force measured when the force:
i) is in the direction of displacement
State the energy changes in the following while in use:
i) Burning of a candle
ii) A steam engineExplain the motion of a planet around the sun in a circular orbit.
Rajan exerts a force of 150 N in pulling a cart at a constant speed of 10 m/s. Calculate the power exerted.
i) Name the physical quantity measured in terms of horse power.
A nut is opened by a wrench of length 20 cm. If the least force required is 2 N, find the moment of force needed to loosen the nut.
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
One end of a spring is kept fixed while the other end is stretched by a force as shown in the diagram.
i) Copy the diagram and mark on it the direction of the restoring force. (figure required)
ii) Name one instrument which works on the above principle.
State the principle of conservation of energy.
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