Water of mass 1.5kg is heated from from 30 o C to 80 o C
PHYSICS
WAEC 2008
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
Correct Answer: A. 4.57 minutes
Explanation
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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