Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoConductionHard2 minQB

PhysicsHardnumerical

Passage / Comprehension

It is winter time and clothes are a great protection against cold. Let us try to understand numerically how. Suppose that you are on a trip to a sub tropical climate like Kashmir where the ambient temperature is 1 °C and your body skin is at 33 °C. The area of the skin is $1.8 m^{2}$ , clothes that you wear are 1 cm thick. The thermal conductivity of the cloth is 0.04 W/m K.

If it starts to rain and clothes become wet so that the conductivity of the clothes is now that of water (0.60 $W / mK$ ), what is the new rate at which heat (in Watt) is conducted through the clothes ?

Answer:

3456.00

Solution:

$\frac{dQ}{dt} = 230.4 \times \frac{0.6}{0.04} = 3456$

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Conduction

⏱ 2mℹ️ Source: QB

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