An Atwood's machine (see the figure below) consists of two masses: one of mass 1.23 kg and the other of mass 4.96 kg. When released from rest, what is the acceleration of the system? (Enter the magnitude in m/s2.)

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.