In the course pack, we looked at this problem with three aluminum rods supporting this $1000-$pound beam, and found that the tensile forces were $400$ pounds in rods A and $C$ and $200$ pounds in rod $B.$

a$.$ What are the tensile forces in the rods if

the temperature of all three rods is

increased by $50$ degrees $F($all rods are

aluminum$)?$

b$.$ What are the tensile forces in the rods if

the temperature of all three rods is

increased by $50$ degrees $F$ AND rod $B$ is

made of steel while rods A and $C$ are

made of aluminum?

Use the properties of steel and aluminum

from problem $1.$

Properties from problem $1$:

Use E $=70$ GPa for aluminum and E $=200$ GPa for steel