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Q.

A pan filled with hot food cools from 50.0oC to 49.9oC in 5 sec. How long with it take to cool from 40.0oC to 39.9oC if the room temperature is 30oC?

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a

2.5 s

b

10 s

c

20 s

d

5 s

answer is B.

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Detailed Solution

dθdt∞(θ-θo)⇒0.15∞(50-30) and 0.1t∞(40-30)
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A pan filled with hot food cools from 50.0oC to 49.9oC in 5 sec. How long with it take to cool from 40.0oC to 39.9oC if the room temperature is 30oC?