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A body cools in a surrounding of constan...

A body cools in a surrounding of constant temperature `30^@C` Its heat capacity is `2 J//^(@)C`. Initial temeprature is `40^@C` and newton law of cooling is valid. The body of mass 1kg cools to `38^@C` in 10 min
When the body temperature has reached `38^@C`, it is heated again so that it reches `40^@C` in 10 min. The heat required from a heater by the body is

A

`3.6J`

B

`7J`

C

`8J`

D

`4J`

Text Solution

Verified by Experts

The correct Answer is:
C
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RESONANCE-HEAT TRANSFER-Exercise
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