If two electrically charged objects repel one another, which of the statements must be true?
a.
one object has more electrons and the other has more protons.
b.
the objects do not have strong electrical fields.
c.
the two objects have the same electric charge.
d.
electrons will flow from one object to the other when they touch each other.

Solar cell a produces 100 joules of energy, when a light source is shown on it for 3 minutes. solar cell b produces 200 joules of energy when the same light source is shown on it for 5 minutes. which solar cell works better? a) solar cell b, because it produces more energy. b) solar cell b, because it generates more power. c) solar cell a, because it produces energy quicker. d) solar cell a, because it generates a greater wattage. eliminate

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?