1. The problem statement, all variables and given/known data A simple pendulum has a length equal to 0.6 m and has a bob that has a mass equal to 0.5 kg. The energy of this oscillator is quantized, and the allowed values of energy are given by En = (n + 1/2)hf0, where n is an integer and f0 is the frequency of the pendulum. Find n if the angular amplitude is 1.0°. 2. Relevant equations En = (n + 1/2)hf0 f0=w(omega)/(2pi) 3. The attempt at a solution I'm stuck at the beginning of finding out the total energy of the pendulum. I think I might have to use the equation U(x)=(1/2)m(w0)^2x^2 to find the energy but I get stuck with unknown values. My biggest question is what does the angular amplitude of 1 degree get used for. I don't think it can just be plugged into the equation as is for an amplitude. Any help on how to approach the problem would be much appreciated.