500g of water is heated so that its temperature rises from 30°C to 72°C in...
PHYSICS
WAEC 1994
500g of water is heated so that its temperature rises from 30°C to 72°C in 7 minutes. calculate the supplied per minute. (Specific heat capacity of water is 4200J\(kg^{-1}K^{-1}\)
- A. 9000J
- B. 12600J
- C. 21000J
- D. 25200J
Correct Answer: B. 12600J
Explanation
\(\frac{Q}{t} = \frac{0.5\times4200\times(72-30)}{7}=12600J\)
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