Alrighty I have to find two real world sinusoidal functions. I found:

1. A piston in an engine moves up and down in a cylinder. The height, h centimeters, of the piston a t seconds is given by the function: h= 120 sin(πt) + 200.
2. You can find the amplitude of a wave with the function: v(t) = Ec sin wct + Ɵ
but I am having a hard time grasping how exactly to answer the following questions about each.. ?
ANY help would be greatly appreciated.
1.What aspect of the natural phenomenon involves data that repeats after a given period of time?
2. How could you use the equation to solve problems?

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