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## Homework Statement

Homework Statement [/b]

The purpose of this lab is to determine the mass of a rubber stopper being swung in a horizontal circle.

I made an apparatus that resembles the picture attached, with a string (with a rubber stopper on one end, and a weight on the other end) put through a tube. I whirl the tube above my head so that a horizontal circle is made by the stopper.

The radius was increased from 0.25m, to 0.45m, to 0.65m, to 0.85m.

This increased the period of the stopper's circular motion, 0.330s, 0.37575s, 0.45925s, 0.50625s, respectively.

The lab requires me to draw graph of my results, with period squared in order to straighten the graph, and calculate the mass of the stopper using the slope of my graph

## Homework Equations

Fc=4(pi)

^{2}mr/T

^{2}

## The Attempt at a Solution

using the equation 4(pi)

^{2}mr/T

^{2}, I rearranged it and found that r is proportional to t

^{2}, as everything else in this experiment is supposed to be constant.

Graphing the radius and period

^{2}, the slope of the line of best fit was 0.25555555s

^{2}/m.

Now this is where I'm not sure what to do, using the slope to find the mass of the stopper.

Thanks for reading this and I hope you can help me out

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