MHT CET Physics question
A disc of moment of inertia kg m is rotating at 600rpm. If the frequency of rotation changes from 600rpm to 300rpm, then what is the work done? [MHTCET 2021]
Answer: (A)
Solution
600 rpm = 10 Hz and 300 rpm = 5 Hz; \frac2^21^2)\frac\frac{9.8}{π^2}$·4π^2(25-100)=-14
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