Water at 25°c and 1 atm is flowing over a long flat plate with a velocity of 14 m/s. determine the distance from the leading edge of the plate where the flow becomes turbulent, and the thickness of the boundary layer at that location. the density and dynamic viscosity of water at 1 atm and 25°c are rho = 997 kg/m3 and μ = 0.891 × 10–3 kg/m·s.

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.