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Water falls from a height of $60 \mathrm{~m}$ at the rate of $15 \mathrm{~kg} / \mathrm{s}$ to operate a turbine. The losses due to frictional forces are $10 \%$ of energy. How much power is generated by the turbine? $\left(\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2\right)$
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The correct answer is:
$8.1 \mathrm{~kW}$
$$
P=0.9 \mathrm{gH} \frac{d m}{d t}
$$
P=0.9 \mathrm{gH} \frac{d m}{d t}
$$
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