(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

So I'm conducting an experiment using simple torque at a set fulcrum, similar to an unbalanced scale (see below), where you know one of the masses and the radii are at equal distances from a central fulcrum and have to find the mass of the other side. I'm having difficulty figuring out how to do this mathematically, if it can be done using just the data given: radii, force of one side, fulcrum. Or perhaps I'm setting it up wrong? Like should there be a counter mass at the top of the fulcrum or something? See: http://is.gd/gasp

Example masses:

r = 6 in

Total length of ruler = 18 inches

Fulcrum at 9 inches

Mass 1: 150g

Mass 2: Unknown

Theta: 25 degrees (let's say like one side is turning downwards at that degree)

2. Relevant equations

τ = rFsin(θ)

3. The attempt at a solution

r(m1)(g)sin(θ) = r(m2)(g)sin(90-θ)

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# Homework Help: Torque Experiment

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