Determine the heat$-$transfer rate from an electronic chip whose surface temperature is $38$C and has an exposed surface area of $3$ cm$2.$ The temperature of the surrounding air is $20$C$.$ The heat$-$transfer coefficient for this situation is

h $=25$

Wm$2$ K

$.$

Express your answer in both SI units $($in W$)$ and U$.$S$.$ Customary units $($in Btu$/$h$).$

rate in W$$ Wrate in Btu$/$h$$ Btu$/$h

What is the R$-$factor $($film resistance, in K $$ m$2/$W$)$ for this situation?

K $$ m$2/$W