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Physics
Physics
Problem
A
40
cm
40\,\text{cm}
40
cm
long aluminium rod (
k
=
205
W
m
−
1
K
−
1
k = 205\,\text{W}\,\text{m}^{-1}\,\text{K}^{-1}
k
=
205
W
m
−
1
K
−
1
) of cross-sectional area
2
cm
2
2\,\text{cm}^2
2
cm
2
conducts a steady heat current of
20
W
20\,\text{W}
20
W
. If the hot end is at
150
∘
C
150^{\circ}\text{C}
15
0
∘
C
, find the temperature of the cold end. a)
45
∘
C
45^{\circ}\text{C}
4
5
∘
C
b)
−
45
∘
C
-45^{\circ}\text{C}
−
4
5
∘
C
c)
148
∘
C
148^{\circ}\text{C}
14
8
∘
C
d)
130
∘
C
130^{\circ}\text{C}
13
0
∘
C
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