A uniform rod of 200 g pivoted at one end. The other end is joined to a horizontal spring. The spring is neither stretched nor compressed when the rod hangs straight down.
What is the rod's oscillation period? You can suppose that the rod's angle from vertical is always small.
The rods axle is contrary end as the spring joined to it. Other spring end joined to wall length of rod is .2m and the spring constant be 3N/m.