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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
  • 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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