1. The problem statement, all variables and given/known data http://i.imgur.com/TZcJkjH.jpg Find the phase constant 2. Relevant equations x(t) = Acos(wt + Φ) x(t) = Asin(wt + Φ) w = 2pi/T 3. The attempt at a solution I see A = 20cm. T = 4s. f = 1/4 = 0.25Hz. w = 2pi/4 = 1.57Hz. 10 = 20cosΦ 0.5 = cosΦ Φ = π/3, 5.24?