Assignment 1 (40 marks) 1. Explain the dilemma faced by engineers when the state of technological change does not exactly match the state of social change yet engineers develop technology to serve society. Use at least three examples, one in each discipline of civil engineering, mechanical engineering and electrical engineering. (20 marks)

Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false

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?