500g of water is heated so that its temperature rises from 30°C to 72°C in...

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
E. 88200J

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Correct Answer: Option B

Explanation

\(\frac{Q}{t} = \frac{0.5\times4200\times(72-30)}{7}=12600J\)

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500g of water is heated so that its temperature rises from 30°C to 72°C in...

Correct Answer: Option B

Explanation

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