Pendulum problem?

Question

What is the period of a pendulum whose length is 1.3m/s, whose amplitude is 10cm and whose mass is 250g? Thanks!!

I really just need to know the appropriate equation for this..

Answer 1

Energy must be conserved in this harmonic system, thus the change in potential energy from the greatest deviation from up and down (the farthest point outward in the swing) to the point where the pendulum is vertical is equal to the change in kinetic energy over the same point. Basically if you crank out all the algebra you will get a very simple formula for the period of a pendulum.

T = 2*pi*sqrt(L/g)