# Homework Help: Damping constant

1. Apr 21, 2012

### Talz1994

1. The problem statement, all variables and given/known data
use your data to find the value of k, compare this theoretical number with your data.
- plot a suitable graph so that you can determine k.

2. Relevant equations
A= A_0e^(-kn)
A_0 initial amplitude = 1

3. The attempt at a solution
hey im new to the forum and yeh here my question. well i was given the homework getting a set of readings of a damped pendulum bob. i got the readings took an average and then i managed to plot a graph of those readings. i did so and i managed to get a graph which decreases exponentially. now i want to compare my therotical damping constant with my data and i have come stuck.
the y axis is amplitude, "A" and the x axis "n" turns

my k value theoretically is 0.22456, but i dont know how to find it from my graph.
should i change my y axis to ln(A_0/A) thats how one of my friend did it but i dont get it.

sorry for poor english, its my second language, first time using forum. and i tried to follow the rules... :/

2. Apr 21, 2012

### Talz1994

anxiously waiting