A body receives heat continuously from an electrical heater of power 10 W. The temperature of the body becomes constant at 50°C when the surrounding temperature is 20°C. After the heater is switched o

Question

A body receives heat continuously from an electrical heater of power 10 W. The temperature of the body becomes constant at 50°C when the surrounding temperature is 20°C. After the heater is switched off, body cools from 35.1°C to 34.9°C in 1 minute. Find the heat capacity of body.

TestHub · Accepted Answer

Steady state: 10 = k ( 50 − 20 ) , so k = 3 1 ​ W/°C. Cooling at mean 35°C: loss = 3 1 ​ × 15 = 5 W. Heat lost in 1 min = 300 J for a fall of 0.2°C, so C = 0.2 300 ​ = 1500 J/°C.

Physics - Heat & Thermo Question with Solution | TestHub

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