First slide

Convection

Question

body cools from 50°C to 49°C in 5 s. How long will it take to cool from 40°C to 39°C? Assume temperature of surroundings to be 30°C and Newton's law of cooling is valid:

Moderate

A

2.5 s
B

10 s
C

20 s
D

5 s

Solution

$\frac{θ_{1} - θ_{2}}{t} = K (\frac{θ_{1} + θ_{2}}{2} - θ_{0})$

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