A tube closed at one end resonates first at a length of 17.5cm and again at a length of 51.5cm. Find the frequency of vibration, given that the speed of sound in air is 340 meter per second​

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.