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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumnumerical

A rod with one end in steam and the other in ice melts 0.2 g of ice per second. It is replaced by a rod of twice the length and half the radius made of a material with three times the conductivity. Find the rate of melting in g $s^{- 1}$ (three decimals).

Answer:

0.07

Solution:

The rate $\propto \frac{k r ^{2}}{l}$ . The factor is $3 \times \frac{1}{4} \times \frac{1}{2} = \frac{3}{8}$ . The new rate is $0.2 \times \frac{3}{8} = 0.075$ g $s^{- 1}$ .

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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