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Required information

A $0\mathrm{.}098-$in$-$diameter electrical wire at $90F$ is covered by $0\mathrm{.}02-$in$-$thick plastic insulation $(k=0\mathrm{.}075Bt\frac{u}{h}*ft*F).$ The wire is

exposed to a medium at $50F,$ with a combined convection and radiation heat transfer coefficient of $2\mathrm{.}5Bt\frac{u}{h}*f{t}^2.F.$

Assume a thermal contact resistance of $0\mathrm{.}001h*f{t}^2\frac{F}{B}tu$ at the interface of the wire and the insulation.

Calculate the total thermal resistance of the electrical wire with insulation. $($You must provide an answer before moving on to the next

part.$)$

The total thermal resistance of the electrical wire with insulation is

h $*$ F$/$Btu$.$