a tap supplies water at 26oC while another supp... - WAEC Physics 1991 Question
a tap supplies water at 26oC while another supplies water at 82oC. If a man wishes to bathe with water at 40oC the ratio of hot mass of hot water to that of cold water required is
A
1:3
B
3:1
C
3:7
D
7:3
correct option: a
heat supplied by hot water = heat gained by cold water M1C(82 - 40) = M2C(40 - 26)
(\frac{M_2}{M_1})= (\frac{14}{42})
= 1: 3
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