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A uniform solid sphere of copper is rotating about a diameter with an angular speed $ω$ . Its temperature is increased by 80°C. $α_{Cu}$ being the coefficient of linear expansion of Cu,new angular speed of the sphere will be :

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ω1+80 αCu

ω1+160 αCu

ω(1+80 αCu)

ω1+180 αCu

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detailed solution

Correct option is B

Iω=constant⇒r2ω=constant ⇒ ω1r12=ω2r22 ⇒ ω2=ω1r2r12=ω1+160 αCu

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A uniform solid sphere of copper is rotating about a diameter with an angular speed ω. Its temperature is increased by 80°C. αCu being the coefficient of linear expansion of Cu,new angular speed of the sphere will be :

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A uniform solid sphere of copper is rotating about a diameter with an angular speed $ω$ . Its temperature is increased by 80°C. $α_{Cu}$ being the coefficient of linear expansion of Cu,new angular speed of the sphere will be :