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
Verified Correct Answer: B.
Physical Principles & Numerical Solution
\(\frac{Q}{t} = \frac{0.5\times4200\times(72-30)}{7}=12600J\)
Source: Myschool Past Questions Archive (Record #26280)