1. The problem statement, all variables and given/known data i was going through uniform circular but a confusion popped out of my head . as i have read before the Rutherford atomic model was only rejected due to the fact that electrons moving in circular orbits need to accelerate constantly to maintain a uniform speed but the acceleration causes electrons to radiate the energy and they would eventually lose all their energy and fall into the nucleus ..... so my question is in uniform circular motion there is a constant acceleration which keeps a uniform speed..is it centripretal acceleration? how?............ and how to calculate the magnitude and direction of this acceleration? ...... and is it a constant?