An incompressible fluid flows through a \(10 \mathrm{in}\). diameter horizontal constant-area pipe. At one section the pressure is \(150 \mathrm{psia}\) and \(1000 \mathrm{ft}\) downstream the pressure has dropped to 100 psia.

(a) Find the total frictional force exerted on the fluid by the pipe.

(b) Compute the average wall shear stress.