How Do You Calculate Electric Fields in Physics Problems?

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Physics_God
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Sorry its sort of in backwards order, 3, 2, 1. These are pages of some homework I was given, I cannot figure out how to do 2b,d.

P.S. I am not a physics god, ha.

Thank you so much for your help.
 
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2b) The equation for a particle in uniform circular motion, which is what is being asked for in this question, is v = 2πr/T. To solve for the period, T, simply rearrange the equation to get T = 2πr/v. Substituting the given values, you get T = 2π(0.50m)/(2.00m/s) = π s.2d) The equation for the centripetal acceleration of a particle in uniform circular motion is a = v²/r. Substituting the given values, you get a = (2.00m/s)²/(0.50m) = 8.00m/s².