2. design a three-bit counterlike circuit controlled by the input w. if w = 1, then the counter adds 2 to its contents, wrapping around if the count reaches 8 or 9. thus if the present state is 8 or 9, then the next state becomes 0 or 1, respectively. if w = 0, then the counter subtracts 1 from its contents, acting as a normal down-counter. use d flip-flops in your circuit.

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?