The hydraulic cylinder operates the toggle, which closes the vertical gate against the pressure of fresh water on the opposite side. the gate is rectangular with a horizontal width of 2 m perpendicular to the paper. for a depth h=3 mof water, calculate the required oil pressure, p, which acts on the 200mmdiameter piston of the hydraulic cylinder

Afan that can provide air speeds up to 60 m/s is to be used in a low-speed wind tunnel with atmospheric air at 35 c. if one wishes to use the wind tunnel to study flat-plate boundary layer behavior up to reynolds numbes of re 10, what is the minimum plate length that should be used? at what distance from the leading edge would transition occur if the critical reynolds nurnber were rer,e = 5 × 105?