Air at 270c and 1 atm flows over a flat plate at a speed of 2 m/s. calculate the mass flow that enters the boundary layer between x = 20 cm and x = 40 cm. the viscosity of air at 270c is 1.85 x 10-5 kg/m. s assume unit depth in the z direction.

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)