Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoCalorimetryMedium2 minQB

PhysicsMediumsingle choice

A solid metal sphere of radius 'r' and specific heat 's' is rotated about an axis passing through its centre at a speed of 'n' rotations per second. It is suddenly stopped and 25% of its energy is used in increasing its temperature, the rise in temperature of sphere is

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Answer:

Solution:

$\frac{25}{100} \times \frac{1}{2} I ω^{2} = m . s .Δ θ$

$\frac{1}{4} \times \frac{1}{2} \times \frac{2}{5} m r^{2} . (2 πn)^{2} = m . s .Δ θ \frac{4 π ^{2} n ^{2} r ^{2}}{20 s} = Δ θ$

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Calorimetry

⏱ 2mℹ️ Source: QB

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