Solution of PART 1
There was no restriction for it expansion.So no tensile or compressive force developed.Longitudinal strains happens only when tensile or compressive force developed in the rod.So answer a
Due to thermal expansion,the diameter of the disc as well of the hole will increase.therefore the moment of inertia will increase resulting in a increase in the angular speed.
Solution of PART 2
Solution of PART 3
dU=dQ-dW or dU=dQ as dQ is negative & dW=o
so dU is negative .dU <0 now dU =nCvdT
so nCvdT <0 or dT<0
3.(c) as dW=pdV so if dW> 0 the dV >0
4. (b),(c) as temperature is constant.
Solution of PART 4
More detailed solution for each question will be given later on
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