Question: The 2 0 - lb rectangular plate has a natural period of vibration t = 0 . 3 s , as it oscillates around the

The 20-lb rectangular plate has a natural period of vibration t=0.3s, as it oscillates around the axis of rod
AB. Neglect the mass of the rod. Suppose that a=3ft,b=5ft.(Figure 1)
Part A
Determine the torsional stiffness k of the rod, measured in lb*ftrad.
Express your answer in pound-feet per radian to three significant figures.
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