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April 21, 2014

Homework Help: Physics

Posted by Alphonse on Monday, October 22, 2012 at 1:47pm.

A simple pendulum consists of a light rod of length L = 0.9 m anchored at a fixed point (like the ceiling), and a small mass m = 0.5 kg attached to the free end.  The configuration is moved to an angle θ = 39 degrees from the vertical and released from rest.  Due to the presence of dissipative nonconservative forces (i.e. air resistance and friction at the anchor), 0.17 J of mechanical energy is removed from the system in its swing from θ to the vertical. i.e.  Wnc = -0.17 J. What is the tension (in Newtons) in the light rod at the instant the pendulum is vertical?

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