Physics HELP!!!!!!!!
posted by Mary on .
The brass bar and the aluminum bar in the drawing are each attached to an immovable wall. At 29°C the air gap between the rods is 2 x 10^3 m. At what temperature will the gap be closed?
The length of the brass rod is 2.0m
The lenght of the aluminum rod is 1.0m
The coefficient of linear expansion of Brass = 19 x 10^6
The coefficient of linear expansion of Aluminum = 23 x 10^6.
I am unsure where to go from here.
gap= deltaL for alum + delta L for Brass
solve for delta T, it is the same in both linear expansions.
Ao do we have to add the specific heat capacities ?
Ao do we have to add the specific heat capacities ?

2E3= (19E6)(2)(DeltaT) + (23E6)(1)(DeltaT)
Simplified equation:
.002= (3.8E5) (DeltaT) + (2.3E5) (DeltaT)
More simpllified:
.002= (6.1E5) (DeltaT)
DeltaT= 32.7869
Answer:
32.7869 + 29 = 61.7869