What is the magnitude of the force of the bead
A 10-cm-long thin glass rod is uniformly charged to +50 nC. A small plastic bead, charged to - 4.8 nC, is 4.2 cm from the center of the rod. What is the magnitude of the force of the bead?
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An elastic cord is 63 cm long when a weight of 57 N hangs from it but is 89 cm long when a weight of 83 N hangs from it. What is the "spring" constant k of this elastic cord?
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