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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermal ExpansionMedium2 minQB

PhysicsMediummultiple choice

A freely rotating isotropic sphere has $α = 1 0^{- 5} K^{- 1}$ . It warms by 100 K with no external torque and no mass loss. Use $R^{'} = R (1 + α Δ T)$ . Select all true statements.

Options:(select one or more)

Answer:

A, B, D

Solution:

Mass stays constant; $I \propto R^{2}$ .

$\frac{I ^{'}}{I} = 1.00 1^{2} .$

Angular momentum is constant, so $\frac{ω ^{'}}{ω} = \frac{1}{1.00 1 ^{2}}$ . $K = \frac{L ^{2}}{( 2 I )}$ decreases as I increases. A, B and D are true.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion

⏱ 2mℹ️ Source: QB

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