WAEC - Physics (1991 - No. 18)
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
1:3
3:1
3:7
7:3
15:8
Explanation
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
\(\frac{M_2}{M_1}\)= \(\frac{14}{42}\)
= 1: 3
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