. Using an adder, draw a circuit to increment or decrement an unsigned 6 PT 4-bit number, X = {X3 X2 X1 X0}. Let X connect to the adder A inputs and let the result be N = {N3 N2 N1 N0}. Ignore the carry-out. Let ID be the increment or decrement signal (0 = increment, 1 = decrement). Hint: Do not use the carry-in input.

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?