for safety reasons, some people leave their front porch light on all the time. If they use a 60-w bulb at 120v, and the local power utility sells energy at 35 cents per kilowatt-hour, how much does it cost to leave the bulb on for a month?

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.