A welding rod with $=30\frac{Bt\frac{u}{h}r}{ft*F}$ is $15$ cm long and has a diameter of $3$ mm $.$ The two ends of the rod are held at $700C$ and $20C.$

$($a$)$ In the units of Btu and J$,$ how much heat flows along the rod each second?

energy in Btu

$0063$

Btu

energy in J

$($b$)$ What is the temperature $($in $C)$ of the welding rod at its midpoint?

$C$