In a flow of air between parallel plates spaced 0.03 m apart, the centerline velocity is 1:2m=s and that 5 mm from the pipe wall is 0:8m=s. Assuming laminar flow, determine the wall shear stress using each of the measurements. Explain whether the flow is laminar or turbulent.

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?