Physics 1- فيزياء١ - Lecture 5 CH6 (in arabic) Circular Motion

physics for engineers and scientists , CH6 explanation and two examples
Q3 " in the boohoo model of the hydrogen atom, and electron moves in a circular path around a proton. the speed of the electron is approximately 2.2 x 10^6 m/s . Find (a) the force acting on the electron as it revolves in a circular orbit of radius 0.529 x 10^-10 m and (b) the centripetal acceleration of the electron.
Q4 " a curve in a road forms part of a horizontal circle. as a car goes around it at constant speed 14.0 m/s, the total horizontal force on the driver has magnitude 130 N. What is the total horizontal force on the driver if the speed on the same curve is 18.0 m/s instead?