A) \[10\times {{10}^{3}}\,W\]
B) \[20\times {{10}^{3}}\,W\]
C) \[4\times {{10}^{3}}\,W\]
D) \[6\times {{10}^{3}}\,W\]
Correct Answer: A
Solution :
The rate of doing work by a machine is called its power. Power \[=\frac{work}{time}\] Water possesses potential energy due to its height, this potential energy equals the work. \[W=mgh=200\times 10\times 50\] \[=100000\,J=100\,kJ\] Given, \[t=10\,s\] \[\therefore \] \[p=\frac{100\times {{10}^{3}}}{10}=10\times {{10}^{3}}W\]
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