One particle has a charge of -1.87 x 10^ -9 while another particle has a charge of -1.10 x 10^ -9 If the two particles are separated by 0.05 m, what is the electromagnetic force between them?

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Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?

What happens when a rubber rod is rubbed with a piece of fur?