An electric drill rated 400W is used to drill a hole in copper of mass...
PHYSICS
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. 100oC
- B. 75oC
- C. 50oC
- D. 45oC
Correct Answer: C. 50oC
Explanation
\(\theta = \frac{Pt}{MC} = \frac{400 \times 20}{0.4 \times 400} = 50^o\)
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