Calculate the response of an undamped system to the excitation of a half sine curve. Assume zero initial conditions. a) Using the arbitrary input method (� = 0 for h(�)) (hint: how do you treat � > � ?) b) Using Laplace transform method (hint: how do you use superposition in this case, �(� + �) = �(�) + �(�)?)

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?