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Question

A liquid is filled in a container which is kept in a room whose temperature is 20C. When temperature of liquid is 80C, it emits heat at the rate of 45 cal s1. When temperature of liquid falls of 40C, using Newtons law of cooling, its rate of heat loss will be

A
15 cal s1
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B
30 cal s1
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C
45 cal s1
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D
60 cal s1
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Solution

The correct option is A 15 cal s1
According to Newton’s law of cooling,
Rate of heat loss Temperature difference
R2R1=40208020=13
R2=R13=453=15 cal s1

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