A) \[45\,\,kl\]
B) \[75\,\,kl\]
C) \[25\,\,kl\]
D) \[90\,\,kl\]
Correct Answer: A
Solution :
Power \[=4.9\,\,kW=4900\] Watt Work done\[(30\,\,\min )=4900\times 30\times 60\,\,J\] If \[m\] is the mass of water in \[kg\] that is pumped out from a depth of \[20\,\,m\] in \[30\] minutes, then total work done for \[30\,\,\min =\]\[mgh=m\times 9.8\times 20\,\,J\] \[\therefore \] \[4900\times 30\times 60=m\times 9.8\times 20\] \[\Rightarrow \] \[m=\frac{4900\times 30\times 60}{9.8\times 20}=45k\,\,l\]You need to login to perform this action.
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