A particle moving in simple harmonic motion passes through the equilibrium point (x = 0) 3 times per second. At t = 0 its velocity at x = -0.08375 m is negative. It travels 0.75 m in a complete cycle.

The particle's position as a function of time is described by the following function:
x(t) = 18.75sin ( 9.42t + ) cm

Question

A particle moving in simple harmonic motion passes through the equilibrium point (x = 0) 3 times per second. At t = 0 its velocity at x = -0.08375 m is negative. It travels 0.75 m in a complete cycle. 

The particle's position as a function of time is described by the following function: 
x(t) =   18.75sin (  9.42t +   ) cm

anonymous · Answer

i have to find phi. i plug t and x in but i cant seem to be getting the right answer. any help will be apreciated :D