A rod of initial lenght 2m at a temperature of 25oC is heated to 80oC. Calculate the increase in length of the rod if its linear expansivity is 4.0 x 10-3K-1
A
0.26m
B
0.44m
C
0.53m
D
0.84m
Verified Correct Answer: B.
Physical Principles & Numerical Solution
\(l_2 - l_1 = \alpha l_1 (\theta_2 - \theta_1) = 4.0 \times 10^{-3} \times 2(80 - 25)\)
= 0.44m
Source: Myschool Past Questions Archive (Record #35176)