# Homework Help: Calculate spring constant for cart attached to a spring

1. Jun 6, 2012

### SharpCode

1. The problem statement, all variables and given/known data
A Cart is floating on an airtrack and is connected by a spring to one fixed object. The cart executes a simple harmonic motion with a period of 4 seconds. Its mass is 2kg. Its maximum displacement from rest position is 1.8m. Calculate the spring constant and provide units.

2. Relevant equations
F= -kx

3. The attempt at a solution
The units would be N/m i am guessing but i am still a little lost. k is the spring constant rearranged it should be:
k = F/x right?

COULD A MOD PLEASE REMOVE THIS OR MY OTHER THREAD. INTERNET CUT OUT BUT MUST HAVE SUBMITTED TWICE

Last edited: Jun 6, 2012
2. Jun 6, 2012

### pcm

how do you relate k , period and mass?

3. Jun 6, 2012

### SharpCode

Hey pcm i posted in my other thread

hoping this one gets removed... double posted by accident

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