One end of a light string is fixed and the other end is attached to a mass M. The string passes over a frictionless pulley so that the mass hangs straight downward to provide tension. The string is vibrated by a small motor with a fixed frequency which generates small amplitude vibrations. When the mass M = 83.1 kg, the string resonates in a mode that has a single anti-node in the middle of the string as shown in the diagram. When the mass M is replaced my a new mass M', the string resonates with 5 anti-nodes. What is the new mass M"? portion of string that is set into vibration M Answer: Choose.. * Check A string is fixed at both ends and stretched taut with tension T. It vibrates with fundamental frequency f. Then the tension is changed, and with the new tension, the fundamental frequency now 7.15f. What is the ratio of the new tension T' to the original value? Calculate T/T. Answer: Check