Hi! I want to build a machine, but I need some precise calculations to complete it. I basically need to have various pendulums of the same length but different frequency I was thinking on using some weights that I could set higher or lower on the pendulum to adjust the frequency. I want to calculate the frequency given the following information: -Length of the pendulum (will be constant) -Weight of the material used throughout the pendulum (will be constant) -Additional adjustable weight -Height of the additional weight I hope it is not to difficult to come up with a formula that considers all of this. Thanks in advance!