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## Homework Statement

A mass oscillating in SHM starts at x=A and has a period of T. At what time, as a fraction of T, does it first pass through x=0?

## Homework Equations

x(t) = Acos(wt + [tex]\varphi[/tex])

## The Attempt at a Solution

I'm not sure if this means I set x(t) = A, or if the [tex]\varphi[/tex] = -A?

Also, does it use A because I'm supposed to recognize that it's equal to amplitude and do something about it (i.e. cancel)? Not too sure how to go about doing this though...any hints?