You notice the rusted outdoor (iron) furniture your parents carefully sand-blasted, primed, and painted last summer. You tell your parents that you have a magic trick to rust-proof the furniture with no more painting (other than to clean it up and paint it one last time). Describe your magic trick.

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?