Water of mass 1.5kg is heated from from 30oC to 80oC using an electric kettle...

WAEC 2008

Water of mass 1.5kg is heated from from 30^oC to 80^oC 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 Answer: Option A

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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Water of mass 1.5kg is heated from from 30oC to 80oC using an electric kettle...

Correct Answer: Option A

Explanation

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