Question

An engine draws water from a depth of 10 m with constant speed at the rate of 10kg/second, the power of the engine is (in watt):(Take :$g=9.8m/s^{2})

• A. 102
• B. 980
• C. 100
• D. 200

Answer 1

The correct option is B 980

work by engine to lift water by height h is given by w=mgh

Power of engine, $P=\frac{dw}{dt}=gh\frac{dm}{dt}$

putting the given information,

$P=9.8\times 10\times 10$

$P=980Watts$