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## Homework Statement

A machine part is undergoing SHM with a frequency of 5 Hz and an amplitude of 1.8 cm. How long does it take the part to go from x=0 to x=-1.80 cm ?

## Homework Equations

x = Acos (ωt + φ)

## The Attempt at a Solution

1.80 cm = 1.80 cm * cos (ωt + φ)

ω = 2πf = 2π* 5hz

cos (ωt + φ) = 1

ωt + φ = 2π

What would φ be?