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
Verified Correct Answer: C.
Physical Principles & Numerical Solution
\(\theta = \frac{Pt}{MC} = \frac{400 \times 20}{0.4 \times 400} = 50^o\)
Source: Myschool Past Questions Archive (Record #35317)