Which of the following is often used as an actuator to control other actuators when the computer needs to control a high-current load? a. oxygen sensor
b. relay
c. crankshaft sensor
d. momentary contact switch

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?