A 45-lb uniform square plate is suspended from a pin located at the midpoint Aof one of it...

A 45-lb uniform square plate is suspended from a pin located at the midpoint Aof one of its 1.2-ft edges and is attached to springs, each of constant k= 8 lb/in. if corner Bis given a small displacement and released, determine the frequency of the resulting vibration. Assume that each spring can act in either tension or compression.