Consider a square flat plate at zero incidence angle to a low-speed incompressible flow. the length of each side is 4 m. assume that the transition reynolds number is 5 × 105 and that the free-stream properties are those at standard sea level. calculate the friction drag on the flat plate when the free-stream velocity is
(a) 20 m/s and when it is
(b) 40 m/s.
(c) assuming that the friction drag, df, varies with velocity as , calculate the value of the exponent n based on the answers from (a) and (b). how close does n come to 2? that is, how close is the friction drag to obeying the velocity squared law?