# Phase constant of SHM homework

1. Nov 3, 2007

### polymerase

The graph shows the position x of an oscillating object as a function of time t. The equation of the graph is x(t)=Acos(wt + $$\phi$$)
where A is the amplitude, w is the angular frequency, and $$\phi$$ is a phase constant. The quantities M,N, and T are measurements to be used in your answers.

See attached image.

What is $$\phi$$ in the equation?

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2. Nov 3, 2007

### polymerase

can anyone help me?

3. Nov 3, 2007

### Staff: Mentor

The attachment has to be approved, but the phase angle (constant) is found for example when t = 0, and knowing x(t=0) = A cos $\phi$, or

$\phi$ = cos-1 (x(0)/A), or

if x(t) is known at t, then

$\phi$ = cos-1 (x(t)/A) - wt

4. Jan 11, 2011