1. The problem statement, all variables and given/known data A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27cm and a frequency of 2.55Hz. How long does it take to travel 11.43cm? 2. Relevant equations x=A*cos(w*t) w=2[tex]\pi[/tex]*f w=2[tex]\pi[/tex]/T T=1/f 3. The attempt at a solution I can't determine the proper way to solve for t, since that's what the question is asking for. Every time I try to solve for t, the calculator gives me a 'math error' message and won't let me compute. The answer is 0.878s, but I need to know how to get it.