(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 0.50 kg particle executes linear harmonic motion about the point x = 0.0. At t= 1.0, it has a displacement x = 0.50m and a speed of 5.0 m/s to the right. The frequency of the motion is 2Hz. Determine (a) the spring constant, (b) the amplitude of the motion, (c) the displacement as a function of time t...blah blah blah...

The rest of the questions wants you to form equations and find displacements at other times which is a piece of cake.

2. Relevant equations

Acos(wt+ phase)

-wAsin(wt+phase)

3. The attempt at a solution

Spring constant is easy - 78.87 N/m.

Ok, when it is asking for amplitude I am little confused. Maybe someone can help clear it up. It says it executes linear harmonic motion at x = 0.0. Does this mean that there isn't a phase angle since it is initially at rest at t = 0s and x = 0? If there isn't a phase angle that makes solving for amplitude so much simpler since I can just set it to 0 and calculate the amplitude using the conditions at t = 1.0s.

Anybody?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Simple Harmonic Motion and amplitude help

**Physics Forums | Science Articles, Homework Help, Discussion**