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\(kg^{-1}K^{-1}\)

  • 9000J
  • 12600J checkmark
  • 21000J
  • 25200J
  • 88200J

The correct answer is: B

Explanation

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