Tisa makes a diagram to organize her notes about charging objects. 2 overlapping circles. The left circle is labeled Friction. The right circle is labeled Conduction. An X is in the overlap.
Which statement should she place in the region marked X?

Electrons move between objects.
The objects do not touch.
The objects develop opposite charges.
The objects have the same charge.

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up