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Four identical metallic objects carry the following charges: +8.2 µC, +7.0 µC, -2.6 µC, and -9.2 µC. The objects are brought simultaneously into contact, so that each touches the others. Then they are separated.
(a) What is the final charge on each object?
(b) How many electrons (or protons) make up the final charge on each object?
A irregular piece of metal has a dry mass of 5.7 kg. Once it is submerged it has an apparent mass of 2.4 kg. What is the density of the piece of metal
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