WAEC - Physics (1994 - No. 36)
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
21000J
25200J
88200J
Wyjaśnienie
\(\frac{Q}{t} = \frac{0.5\times4200\times(72-30)}{7}=12600J\)