Which statement best answers the question, "why is copper a good conductor of electricity? "? a. copper atoms have a loosely held electron in their outer shell that is able to move freely to other atoms b. copper atoms are tightly bound and are able to work with other copper atoms to exchange electrical charges c. copper has an equal number pf protons and electrons making the flow of current possible. d. copper's outer shell electrons are not balanced and must join with other copper atoms in order to be stable.

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

Asubject in a clinical research trial experiences a serious, unanticipated adverse drug experience. how should the investigator proceed, with respect to the irb, after the discovery of the adverse event occurrence? a. do not report the adverse drug experience to the irb since it is a common adverse experience.b. report the adverse drug experience to the irb only if there are several other occurrences.c. report the adverse drug experience as part of the continuing review report.d. report the adverse drug experience in a timely manner, in keeping with the irb's policies and procedures, using the forms or the mechanism provided by the irb.

The heliocentric and the geocentric models of the solar system included these central principles