Air at standard conditions flows over a flat plate. The freestream speed is \(30 \mathrm{ft} / \mathrm{s}\). Find \(\delta\) and \(\tau_{w}\) at \(x=3 \mathrm{ft}\) from the leading edge assuming

(a) completely laminar flow (assume a parabolic velocity profile) and

(b) completely turbulent flow (assume \(\mathrm{a} \frac{1}{7}\)-power velocity profile).