JAMB - Physics (2025 - No. 21)
Without considering the containing vessel, what mass of boiled water can raise the temperature of 8 kg of water from 25°C to 60°C when mixed in a heat-proof container?
10kg
7kg
5kg
6kg
Explanation
Answer: B. 7kg
(Heat balance: m × 4200 × (100 - 60) = 8 × 4200 × (60-25);
m = \(\frac{(8 \times 35)}{40}\) = 7 kg.)
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