41. a 2.5-g copper penny is given a charge of −2.0 × 10−9 c . (a) how many excess electrons are on the penny? (b) by what percent do the excess electrons change the mass of the penny?

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

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