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1. The problem statement, all variables and given/known data

A pendulum with length L is suspended at an angle theta. At the bottom of the pendulum, a string is attached to force meter. The string attached to the force meter is perpendicular to the pendulum string. In terms of F and theta, find an expression for mass.

2. Relevant equations

F_{g}= -mg

(F_{g})_{r}= -mgcos(theta)

(F_{g})_{t}= -mgsin(theta)

3. The attempt at a solution

What I get is all the tangential and radial components cancel out equally zero, which I would expect because mass doesn't matter in a pendulum. So I don't understand how I'm suppose to obtain an expression for mass.

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# Homework Help: Pendulum measuring the restorative force HELP

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