SOLVED:A counter-rotating eccentric mass exciter consisting of two rotating 14- oz weights describing circles of 6 -in. radius at the same speed but in opposite senses is placed on a machine element to induce a steady-state vibration of the element and to determine some of the dynamic characteristics of the element. At a speed of 1200 rpm, a stroboscope shows the eccentric masses to be exactly under their respective axes of rotation and the element to be passing through its position of static eq

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