Ultimate tensile strength is: (a) the stress at 0.2% strain (b) the stress at the onset of plastic deformation (c) the stress at the end of elastic deformation (d) the stress at fracture (e) the maximum stress in a stress-strain curve

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?