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A woman pulls a bucket of water of total mass $5\ kg$ from a well which is $10\ m$ in $10\ s$. Calculate the power used by her. [Take $g=10\ ms^{-2}$]
As given, mass of the water $m=5\ kg.$
Time taken to pull the bucket of water $t=10\ seconds$
Height of the well $h=10\ m$
Energy used to pull the bucket of water $W=mgh$
$=5\times10\times10$
$=500\ Joule$
Power used by the woman for pulling the bucket $P=\frac{W}{t}$
$=\frac{500\ J}{10\ sec.}$
$=50\ Watt$
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