Consider fluid flow over a surface with a velocity pro- file given asDetermine the shear s...

Consider fluid flow over a surface with a velocity pro- file given as

Determine the shear stress at the wall surface, if the fluid is (a) air at 1 atm and(b) liquid water. both at 20°C. Also calculate the wall shear stress ratio for the two fluids and interpret the result.

Answers: (a) 1.83 × 10 N/m2 (b) 0.100 N/m2