Acylindrical part of diameter d is loaded by an axial force p. this causes a stress of pia, where a= 10-14. if the load is known with an uncertainty of 112 percent, the diameter is known within 14 percent (tolerances), and the stress that causes failure (strength) is known within t19 percent, determine the minimum design factor that will guarantee that the part will not fail.

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?