# Harmonic Motion

1. Nov 13, 2008

### redhot209

1. The problem statement, all variables and given/known data
A 0.296 kg mass is attached to a spring and executes simple harmonic motion with a period of 0.18 s. The total energy of the system is 3.3 J. Find the force constant of the spring. Answer in units of N/m.

2. Relevant equations
k=m(t/2$$\pi$$)^2

3. The attempt at a solution
k=296(0.18/2$$\pi$$)^2
I get 0.0002429276699 but it is wrong. Any ideas what i did wrong?

Last edited: Nov 13, 2008
2. Nov 13, 2008

### Mattowander

Your equation is wrong. The period should be T = 2pi times the square root of (m/k). I believe that your equation has (k/m) instead of (m/k). Hope that helps.

3. Nov 13, 2008

### physics girl phd

Note also: you should learn the trick of carrying through your units and checking them... that would have helped you find this error.