First slide

Convection

Question

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

Moderate

A

2.5 s
B

10 s
C

20 s
D

5 s

Solution

$\frac{dθ}{dt} \infty (θ - θ_{o}) \Rightarrow \frac{0.1}{5} \infty (50 - 30) and \frac{0.1}{t} \infty (40 - 30)$

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