A sphere of density p, specific heat capacity c and radius r is hung by a thermally insulating thread in an enclosure which is kept at a lower temperature than the sphere. The temperature of the sphere starts to drop at a rate which depends upon the temperature difference between the sphere and the enclosure and the nature of the surface of sphere and is proportional to:

Question

Infinity Learn · Accepted Answer

−$$dTdt=$$σAmcT−$$T0=$$σ$$4$$$$π$$$$r2$$ρ×$$43$$$$π$$$$r3cT$$−$$T0$$∴ −dTdt∝$$1$$ρrc

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