A car of 15 kg is traveling on a circular track. If the radius of the track is 7.8 m and the period is 8.5 seconds, what's the centripetal force on
the car? (Round to the nearest hundredth)

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.