Water at \(350 \mathrm{~K}\) is flowing through a pipe at a flow rate of \(0.3 \mathrm{~kg} / \mathrm{s}\). The pipe is \(10 \mathrm{~mm}\) in diameter and has roughness, \(\varepsilon=0.001(\mathrm{~m})\).

a. What is friction factor?

b. Estimate the value of the heat transfer coefficient.