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In table salt-sodium chloride, NaCl-the Na+and Cl^- ions are arranged in a cubic crystal structure. You can observe in this structure a cube made up of eight ions: four Na^+ and four Cl^- in alternating corners. Each Na^+ has a radius of 99 pm, each Cl^- has a radius of 181 pm, and the ions are spaced as though they were solid balls of these sizes, touching their neighbors.
Part A) For a single cube of this arrangement, what are the magnitude and direction of the electric field at one of the Na^+ ions due to the other seven ions in the cube?
Part B) What are the direction and magnitude of the vector sum of the electric forces exerted on this Na^+ ion with the other seven ions?
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A 70.0 kg circus performer slides 4.90m down a pole to the circus floor, starting from rest. What is the kinetic energy of the performer as she reaches the floor if the frictional force on her from the pole (a) is negligible (she will be hurt) and (b..
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