Water of mass 1 5kg is heated from from 30oC to... - WAEC Physics 2008 Question
Water of mass 1.5kg is heated from from 30oC to 80oC using an electric kettle which is rated 5A, 230V. Calculate the time taken to reach the final destination [specific heat capacity of water 4200Jkg-1K-1]
A
4.57 minutes
B
5.02 minutes
C
7.30 minutes
D
10.04 minutes
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Correct Option: A
t = (\frac{MC\theta}{2} = \frac{1.5 \times 4200 \times 50}{5 \times 230})
= 273.91s or 4.57 mins
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