REAL-WORLD SCENARIOS Because a residential electrical system uses 120/240-volt alternating current, electricians use alternating current general-use snap switches. If you encounter a direct current
switching situation, what kind of switch rating would you need to use?

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?

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

Plan an experiment to measure the surface tension of a liquid similar to water. if necessary, review the ncfmf video surface tension for ideas. which method would be most suitable for use in an undergraduate laboratory? what experimental precision could be expected?