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Physics
Physics
Problem
10.20 A body cools from
80
∘
C
80^{\circ} \mathrm{C}
8
0
∘
C
to
50
∘
C
50^{\circ} \mathrm{C}
5
0
∘
C
in 5 minutes. Calculate the time it takes to cool from
60
∘
C
60^{\circ} \mathrm{C}
6
0
∘
C
to
30
∘
C
30^{\circ} \mathrm{C}
3
0
∘
C
. The temperature of the surroundings is
20
∘
C
20^{\circ} \mathrm{C}
2
0
∘
C
.
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