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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferHard2 min

PhysicsHardnumerical

A lamp-black ball at $22 7^{\circ}$ C in surroundings at $2 7^{\circ}$ C has a rate of cooling $R$ . Find the rate of cooling, in units of $R$ , when the ball is at $72 7^{\circ}$ C (two decimals).

Answer:

18.23

Solution:

The rate $\propto T^{4} - T_{0}^{4}$ . $\frac{100 0 ^{4} - 30 0 ^{4}}{50 0 ^{4} - 30 0 ^{4}} = \frac{9.919 \times 1 0 ^{11}}{5.44 \times 1 0 ^{10}} = 18.23$ .

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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