1. Include the diameter d of the hole and the viscosity m in the list of variables in Prob. 6.9. Find an expression that relates the variables.
2. The pressure drop Dp over a horizontal section of pipe of diameter d depends on the average velocity, the viscosity, the ?uid density, the average height of the surface roughness elements, and the length of the pipe section. Write an expression that relates the pressure drop to the other variables.