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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionMedium2 minQB

PhysicsMediumsingle choice

A uniform solid brass sphere rotates at $ω_{0}$ about a diameter. Its temperature increases by $10 0^{\circ} C$ . What is its new angular speed? $α_{B} = 2.0 \times 1 0^{- 5}^{\circ} C^{- 1}$ .

Options:

Answer:

Solution:

No external torque implies $I ω$ constant.

$R^{'} = 1.002 R and I \propto R^{2} . ω^{'} = \frac{ω _{0}}{( 1.002 ) ^{2}} ≃ 0.996 ω_{0} .$

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

⏱ 2mℹ️ Source: QB

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