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Q. A moving electron passes near the nucleus of a gold atom, which contains 79 protons and 118 neutrons. At a particular moment the electron is a distance of 7.5 x10 ^9 m from the gold nucleus.

Q. A penny of mass 3.1 g rests on a small 20 g block supported by a spinning disk. The coefficients of friction between the block and the disk are 0.75 (static) and 0.64 (kinetic) while those for the penny and the block are 0.520 (static) and 0.450 (kinetic). What is the maximum rate of rotation that the disk can have, without the block or penny sliding on the disk.

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