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I'm a math students, and I've got physics homeworks to do, and... I need some help

To make it short, I solved the approximation of the differential equation of the angle of a pendulum in function of time, and I got this:

[tex] \theta(t)=\frac{B\sqrt{L}sin(\frac{t\sqrt{g}}{\sqrt{L}})}{\sqrt{g}}+Acos(\frac{t\sqrt{g}}{\sqrt{L}}) [/tex]

Up to now it's pretty ok, but now I'm asked to find the period (is that word right?) and amplitude of this solution in function of A and B. Since I have absolutely no idea what these could be, I'm now asking you

Oh, and a few more little things...

How can I find the tension of the string in such a pendulum?

What do x''(t) and y''(t) represent in this situation? The horizontal and vertical accelerations perhaps?

Thank you very much!!

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# Homework Help: Simple pendulum help

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