A) 3.3 kW
B) 0.33 kW
C) 0.033 kW
D) 33 kW
Correct Answer: A
Solution :
Efficiency of engine,\[\eta =60%\] Thus, power\[=\frac{work/time}{\eta }=\frac{100}{60}\times \frac{mgh}{t}\] Given, \[m=100\,\,kg,\,\,h=10m,\,\,t=5\,\,s\] and \[g=10\,\,m{{s}^{-2}}\] Hence, power\[=\frac{100}{60}\times \frac{100\times 10\times 10}{5}\] \[=3.3\times {{10}^{3}}W\] \[=3.3\,\,kW\]
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