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Water of mass 120g at 50oC is added to 200g of water at 10oC and...

Physics
WAEC 2002

Water of mass 120g at 50oC is added to 200g of water at 10oC and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]

  • A. 60oC
  • B. 40oC
  • C. 25oC
  • D. 10oC
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Correct Answer: Option C
Explanation

120 x 4.2(50 - \(\theta\)) = 200 x 4.2(\(\theta\) - 10)

\(\theta = \frac{33600}{1344} = 25^oC\)

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