A ring of moment of inertia 4.9/(pi)^2 kgm^2 is rotating with 300 rpm. If the frequency of rotation is reduced by 120 rpm, then the work done is - VgyanHub

Question:

7.A ring of moment of inertia 4.9/(pi)^2 kgm^2 is rotating with 300 rpm. If the frequency of rotation is reduced by 120 rpm, then the work done is

Options :

a) 115 J
b) 157 J
c) 148 J
d) 96 J

Answer :

b) 157 J

Answer Steps :

Step1 :-

Step2 :-

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