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## Homework Statement

http://img534.imageshack.us/img534/6503/questiono.jpg [Broken]

## Homework Equations

## The Attempt at a Solution

**(a)**I'm not sure how to approach this part. I appreciate any help to get me started.

**(b)**I know that the period of oscillation is given by

[itex]T'=\frac{2 \pi}{\omega '}[/itex]

I can use this later on to express my results in terms of the period T'. The one term in the given expression for x(t) that can turn negative as time increases would be the δ in the cosine. So how do I evaluate the right value for the phase delta?

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