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Question

Two coaxial disc, having moments if inertia I1 and I12, are roatating with respective angular velocities ω1 and ω12, about their common axis. They are brought in contact with each other and thereafter they rotate with a common angular velocity. If Ef and Ei the final and initial total energies, then (EfEi) is :

A
I1ω2112
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B
38I1ω21
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C
I1ω216
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D
I1ω2124
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Solution

The correct option is D I1ω2124
E=12I1×ω21+12I22×Ω214
I1ω212(98)=916I1ω21
I1ω1+I1ω14=3I12ω
54I1ω1=3I12ω
ω=56ω1
Ef=12×3I12×2536ω21
=2548I1ω21
EfEi=I1ω21(2548916)=248I1ω21
=I1ω2124

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