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A small windmill is cable of producing electrical power required for a 100 watt bulb to glow for 4 hours. find the average kinetic energy of wind if the efficiency of mill is 15 %

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96 ×

10^{5}

joules

96 ×

10^{8}

joules

96 ×

10^{15}

joules

6 ×

10^{5}

joules

answer is A.

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Detailed Solution

Energy consumed by bulb = power × time in sec
= 100 × 4 × 3600
= 144 ×

10^{4}

joules
Since the efficiency is 15 %
Thus, the average kinetic energy of wind =

\frac{power}{effeciency}

\frac{144 \times 10^{4}}{0.15}

= 96 ×

10^{5}

joules

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A small windmill is cable of producing electrical power required for a 100 watt bulb to glow for 4 hours. find the average kinetic energy of wind if the efficiency of mill is 15 %

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