A) 3.3 kW
B) 0.33 kW
C) 0.033 kW
D) 33 kW
Correct Answer: A
Solution :
Key Idea: Water possesses potential energy due to its height The rate of doing work by a machine is called its power. Power\[=\frac{work}{time}\] In terms of efficiency \[(\eta )\] Power \[=\frac{work/time}{\eta }\] Given, \[\eta =\frac{60}{100},\,\,W=mgh=100\times 10\times 10\], \[t=5\,s\] s. \[\therefore \] \[P=\frac{100\times 10\times 10}{5}\times \frac{100}{60}\] \[\Rightarrow \] \[P=3.3\times {{10}^{3}}W\] \[P=3.3\,\,kW\]You need to login to perform this action.
You will be redirected in
3 sec