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Q.

A fly wheel having moment of inertia 10 kg m2 is rotating at 50 rad/s. What amount of work needs to be done in order to bring this flywheel to rest in 10s.

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a

13000 J

b

11400 J

c

14500 J

d

12500 J

answer is B.

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Detailed Solution

Work done Δ K.E
W=K⋅Ef−K⋅E1∘K⋅Ef=0K⋅E1=12Iω2ω=12Iω2=12×10×(50)2=−12500J
So the amount of work done to bring the flywheel to rest is 12500J
 

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