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MBA, Ph.D in Management
Harvard university
Feb-1997 - Aug-2003
Professor
Strayer University
Jan-2007 - Present
coeff of linear expansion:
a (for brass)=19
a (for copper)= 17
The brass and copper rods in the figure are attached to immovable barriers. The gap between them is 2.5 mm. The length of the brass rod is 1.9 m and the length of the copper rod is 2.4 m.
By how much must the temperature of the rods be increased in order to close the gap? answer in Celsius
Â
HINT:The change in length ΔL of either rod is given by ΔL=αL0ΔT (Equation 13.2.1), where
α is the coefficient of linear expansion (Table 13.2.1). The sum of the changes in length of each rod must equal the initial gap width.
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