(a) how many electrons would have to be removed from a penny to leave it with a charge of +1.0×10−7 c? [4]
(b) to what fraction of the electrons in the penny does this correspond? [6]
[a penny has a mass of 3.11 g; assume it is made entirely of copper.]

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.

If you place a magnet under a clear dish, and sprinkle iron fillings over it, above what part of the magnet will most of the fillings gather