Okay this is the last question of the lab and I don't get it(adsbygoogle = window.adsbygoogle || []).push({});

Basically its a lab where we find how amplitude, bob mass, and length affects the period T for each time.

Our finding was that length affects the period a lot. I did a bunch of graphs and tables and answered all the questions but don't know how I derive this

the question is "From your graph of T^2 vs. L

determine a value for g."

T here is the period in seconds and L is the length of the string in cm. Now I do have to graph and it looks pretty normal to me.

The slope is 0.03900 and the r is 0.9947

now I dont think this would help much at all

(unless its r-slope haha...)

I have to find g from this graph and calculate the percent of error

I know how to calculate the percent of error but I don't know how I can find g from this graph

the points are for x which is length

50

60

70

80

90

100

and for T^2 i have

2.2831

2.4586

2.89

3.3562

3.7288

My first guess was i need to find an equation for this relationship and then

use the formula 4pi^2/g x L = T^2 but I don't know what to do?

plug in what for L? someone please help!

**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!

# T^2 vs L determining g?

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