A) \[10J/s\]
B) \[98J/s\]
C) \[49J/s\]
D) zero
Correct Answer: D
Solution :
Power is defined as rate of change of energy in a system or the time rate of doing work. \[P=\frac{dE}{dt}\] \[=\frac{dW}{dt}\] Also work = force\[\times \]displacement\[=F\times d\] In a circular motion, displacement is zero, therefore, \[P=\frac{d}{dt}(F\times d)\] \[=\frac{d}{dt}(0)=0\]
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