1. The problem statement, all variables and given/known data The figure below shows the kinetic energy K of a simple pendulum versus its angle θ from the vertical. The pendulum bob has mass 0.260 kg. What is the length of the pendulum? 2. Relevant equations K=(1/2)mv2 U=mgh x(t)=xm*cos(w*t+phi) *where w is the angular frequency, and the wt + phi being the phase 3. The attempt at a solution Basically I have gone through a series of approaches to this problem, but I have come to settle with this one: I started by getting phi from the graph, .100 radians. Then, I attempted to relate gravitational potential energy to the max kinetic energy that was given from the graph (.015 J). This way, I could get h, and relate h to the maximum angle and the pendulum length. To do that, I would use x(t)=xm*cos(w*t+phi). I'm not sure if I should use the simple pendulum equations, but I don't think I need to know the inertia.