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Bigworldjust
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Homework Statement
A 225g mass attached to a horizontal spring oscillates at a frequency of 4.00 Hz. At t=0s, the mass is at x = 5.00 cm and has v_x = -37.0cm/s . Determine the phase constant.
Homework Equations
velocity = v(t)
v(t) = Aω·cos( ωt + ϕ )
The Attempt at a Solution
-37 cm/s = ( 5.2122*10^-2 m )( 25.133 rad/sec )cos( 0 + ϕ )
-0.282 = cos( ϕ )
ϕ = cos⁻¹( -0.282 )
ϕ = 106.40º = 1.857 radians ◄---
However that answer is wrong, and I am not sure why. Can anyone help?
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