- #1

Ly444999

- 19

- 0

## Homework Statement

http://imgur.com/a/FDfAp

What is the phase constant?

## Homework Equations

x(t) = A*cos(ωt+Φ)

## The Attempt at a Solution

If I'm not mistaken at t = 0 the graph starts at half the amplitude or 5. Also the amplitude of this graph is 10, and at t = 0 angular velocity is also 0.

5 = 10*cos(0 + Φ)

Φ = arccos(5/10)

Φ = π/3

The answer is supposed to be -2π/3, I'm not sure what I did wrong or if I'm even doing the question right.

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