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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumnumerical

Two cylindrical rods of the same material have the same temperature difference. The ratio of the rates of flow of heat is 1 : 12 and the radii are in the ratio 1 : 3. Find the ratio $\frac{l _{1}}{l _{2}}$ of their lengths (two decimals).

Answer:

1.33

Solution:

Rate $\propto \frac{r ^{2}}{l}$ . $\frac{1}{12} = \frac{\frac{1}{9}}{\frac{l _{1}}{l _{2}}}$ , so $\frac{l _{1}}{l _{2}} = \frac{12}{9} = 1.33$ .

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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