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]

  • 100oC
  • 75oC
  • 50oC checkmark
  • 45oC

The correct answer is: C

Explanation

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