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Question 1: The rigid, massless bar of length L shown below has a pinned joint at its left end and is supported by a vertical spring ki at its right end. The bar is also suspended by a vertical spring k2 at the location of 2L/5 from the left end. A mass m is lumped at the right end. Determine the natural frequency and period for vibration of the concentrated mass m. Assume small vibration. fun Pivot Rigid, massless bar guminy 2L ន 3L 5 5