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WAEC Physics 2010 Paper
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© africaexams.com
Question : 21
Total: 50
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
-1
K
-1
]
100
o
C
75
o
C
50
o
C
45
o
C
Validate
Solution:
θ
=
P
t
M
C
=
400
×
20
0.4
×
400
=
50
o
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