Physics - Heat & Thermo Question with Solution | TestHub

A 20 mm diameter copper pipe is used to carry heated water. The external surface of the pipe is at $\mathrm{T}=$ 127°C and its surrounding is at ${\mathrm{T}}_0=27^{\circ }\mathrm{C}$. The outer surface of the pipe radiates like a black body and also loses heat due to convection. The convective heat loss per unit area per unit time is given by $\mathrm{h}\left(\mathrm{T}-{\mathrm{T}}_0\right)$ where $\mathrm{h}=6\mathrm{W}{\left({\mathrm{m}}^2\mathrm{K}\right)}^{-1}$. Calculate the total heat lost by the pipe in unit time for one meter of its length.