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Question

a hollow sphere of mass M (in K.G.) radius R (in m.) is rotating with angular frequency omega(in rad\sec) . it suddenly stops rotating and 75% of the K.E. converted into heat energy . if S joule\kg-kelvin is the spesific heat of material of the sphere, the rise of temperature of the sphere is ?

Joshi sir comment

Rotational K. E. = 1/2 I ω²

so 0.75 [1/2 I ω²] = M S dT

and I = 2/3 M R²

now solve

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PAYAL RAJPUT 7 year ago is this solution helpfull: 16 6

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