# phase constant of SHM

by 1MileCrash
Tags: constant, phase
 P: 1,177 1. The problem statement, all variables and given/known data The displacement of a mass oscillating on a spring is given by x(t) = xmcos(ωt + ). If the initial displacement is zero and the initial velocity is in the negative x direction, then the phase constant is: 2. Relevant equations 3. The attempt at a solution How do I start? The book just tells me that the phase constant depends on displacement and velocity when t = 0, but doesn't say how.
 Mentor P: 11,200 Sketch a cosine curve. What's its initial value? Where on the curve would match the initial condition of the spring and mass? What's (angular) the offset from zero?
P: 1,177
 Quote by gneill Sketch a cosine curve.
OK

 What's its initial value?
1

 Where on the curve would match the initial condition of the spring and mass?
Huh??

Mentor
P: 11,200

## phase constant of SHM

Does the mass start at a maximum extension like the cosine function does?
 P: 1,177 No, initial displacement is 0. So, I need to find where cosx equals 0?
Mentor
P: 11,200
 Quote by 1MileCrash No, initial displacement is 0. So, I need to find where cosx equals 0?
Not only that, but where it's going through zero and going negative, just like the mass' displacement.
 P: 1,177 Still have no clue on this.
 Mentor P: 11,200 Have a gander: Attached Thumbnails

 Related Discussions Introductory Physics Homework 3 Introductory Physics Homework 2 Introductory Physics Homework 4 Introductory Physics Homework 1 Introductory Physics Homework 5