A uniform bar of 165-N is supported horizontally by two similar wires A and B. A small cube of lead of 185 N is positioned 3/4 of the way from A to B. The wires are each 75.0 cm long and encompass a mass of 5.50 gram. When both of them are plucked at the center, determine the frequency of the beats which they will generate if vibrating at their basic frequency?