$5.)(5)$ A C$36000$ soft brass pipe has an inner radius of $0\mathrm{.}7$ in$.$ and a wall thickness of $0\mathrm{.}20$ in$.$ If the fluid flowing through it changes the temperature of the pipe to $140F,$ determine the thermal stress in the pipe. The pipe was fitted between the walls when the pipe was at $70F.$ Also determine if Hooke's law is valid, if it is safe and the axial force the bar exerts on the walls. Assume the wall is rigid.

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