The radius of a typical human eardrum is about 4.15 mm. calculate the energy per second received by an eardrum when it listens to sound that is at the threshold of hearing, assumed to be 1.20e-12 w/m2

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.