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Q. A 1.27-kg block slides across a rough surface such that it slows down with an acceleration of 1.40 m/s2. What is the coefficient of kinetic friction between the block and the surface?

Q. When two identical ions are separated by a distance of 5.9 10-10 m, the electrostatic force each exerts on the other is 6.0 10-9 N. How many electrons are missing from each ion?

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