Timothy noticed that copper wires are wrapped in a plastic material to prevent you from getting shocked when you touch them. Which list shows other materials that could be used to wrap the copper wire?

What is the function of the commutator in a dc motor? a. to spin the magnet b. to change direct current into alternating current c. to change alternating current into direct current d. to spin the wire coil

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

What is a good example of instantaneous speed