Aworker is raising a 9.2-m-long ladder of mass 53 kg asshown.
knowing that a = 1.8m and that the force exerted bythe worker is
perpendicular to the ladder, determine (a)the forceexerted by the
worker, (b) the reaction at b.

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?