An electric drill rated 400W is used to drill a hole in copper of mass...

WAEC 2010

An electric drill rated 400W is used to drill a hole in copper of mass 400g in 20s. Calculate the rise in temperature if all the heat produced is absorbed by the copper. [specific heat capacity of copper = 400Jkg^-1K^-1]

A. 100^oC
B. 75^oC
C. 50^oC
D. 45^oC

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Correct Answer: Option C

Explanation

\(\theta = \frac{Pt}{MC} = \frac{400 \times 20}{0.4 \times 400} = 50^o\)

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An electric drill rated 400W is used to drill a hole in copper of mass...

Correct Answer: Option C

Explanation

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