Question: urgent please answer all A fluid flows with an average speed of 0.8m 's inside a cylindrical pipe with diameter D 25mm and length L

urgent please answer all
A fluid flows with an average speed of 0.8m 's inside a cylindrical pipe with diameter D 25mm and length L 12m, on the walls of which a constant thermal flow is applied. At the entrance to the pipe, the fluid has a temperature T20 " C while in the outlet section it has the temperature T=75C. The following correlations are known for heat exchange Nu=4.36 laminar flow (Rep
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