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s3a
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Homework Statement
The problem along with its solution is attached as TheProblemAndSolution.jpg.
Here is the textual part of the attached image:
“In Fig. 1 a 20 ft-frame PQ is supported at two points L and M, 6 ft and 4 ft respectively from the edges. If a 300 lb load is attached to edge Q, determine the range of load W that must be placed at P to keep the frame in equilibrium.”
Homework Equations
Vectorial torque and force summations.
The Attempt at a Solution
I actually understand the mathematical explanation that the solution gives, but I am trying to fully understand this theoretically.
I get, mathematically, when we considering fulcrum L, for example, to be point from which we consider the rotation, that if W is toward the smaller value in its range, fulcrum M will apply a larger upward force to the frame, but how does the theory behind the vectorial sums take this into account?
Basically, can someone give me a non-mathematical (or less-mathematical) explanation to why there is more than one value for W where there is no rotation (i.e., where the net torque is zero)?
Any input would be greatly appreciated!