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Hot water at temperature of t is added to twice that amount of water at...

Physics
WAEC 2025

Hot water at temperature of t is added to twice that amount of water at a temperature of 30°C. If the resulting temperature of the mixture is 50°C, calculate t

  • A. 40°C
  • B. 80°C
  • C. 90°C
  • D. 50°C
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Correct Answer: Option C
Explanation

Heat loss by hot water = Heat gained by water

mc(t - 50) = 2mc(50 - 30)

t - 50 = 2(20)

t - 50 = 40

t = 40 + 50

\(\therefore\) t = 90°C


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