Question:
A calorimeter contains $50 \mathrm{~g}$ of water at $50^{\circ} \mathrm{C}$. The temperature falls to $40^{\circ} \mathrm{C}$ in 10 minutes. When the calorimeter contains $100 \mathrm{~g}$ of water at $50^{\circ} \mathrm{C}$, it takes 18 minutes for the temperature to become $45^{\circ} \mathrm{C}$. Find the water equivalent of the calorimeter.
Solution:
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