Q.8 a) Define power. Write S.l unit
b) An electric bulb is rated 10 W. what does it mean, what is the energy consumed in joules if it is used for 5 minutes.
Q.9 a) what is reverberation of sound?
b)Draw a diagram depicting low pitched and high pitched sound. Also w e we difference.
Q.10 a) when an athlete comes running from a distance, he is able to jump longer.Why
b)The velocity time graph of a bail of mass 20gm moving along a straight line on a
long table is given in figure. How much force does the table exert on the ball to bring it to the rest?
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Answer:
The amount of energy transferred per unit the amount of work done is called power and it's si unit is watt
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Answer:8 a) The rate of doing work is called power.
OR
The rate of consumption of energy is called power.
The S.I. unit of power is Watt.
Explanation:
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