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A body cools from 50.0°C to 49.9°C in 5s. How long win it take to cool from 40.0°C to 39.9°C? Assume the temperature of surroundings to be 30.0°C and Newtons law of cooling to be valid.
(a) 2.5 s
(b) 10 s
(c) 20 s
(d) 5 s
(b)
Rate of cooling is proportional temperature difference between system and surrounding.
As the temperature difference is halved, so the rate of cooling will also be halved
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