- #1

- 29

- 0

## Homework Statement

http://i.imgur.com/u8vUv5a.jpg

Find the phase constant.

## Homework Equations

x(t)=Acos(ωt + Φ)

v(t)=-Aωsin(ωt + Φ)

Vmax = ωA

ω=2π/T

## The Attempt at a Solution

ω = 2π/12 = 0.5236

A = 60/0.5236 = 114.59 cm

v(0) = -30 = -114.59(0.5236)sinΦ

0.5 = sinΦ

Φ = π/6 and 5π/6. Which angle is correct?