Net torque for a system in rotational equilibrium:
Στ = 0
τ = rFsinθ
Summing the torques on the case with M1:
Take counterclockwise as positive.
A rod of negligible mass is pivoted at a point that is off-center, so that length l1 is different from length l2. The figures show two cases in which masses are suspended from the ends of the rod. In each case the unknown mass m is balanced by a known mass M1 or M2 so that the rod remains horizontal.
What is the value of m in terms of the known masses?
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