Question 1138797
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The maximum load of 
a horizontal beam that is supported at both ends varies directly as the width and the square of the height and inversely as the length between the supports.
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L, the load, maximum
w, width
h, height
x, length between the supports
k, variation constant


{{{highlight_green(L=kwh^2/x)}}}


When you have sufficient given information, you may substitute it to evaluate k.

{{{k=Lx/(wh^2)}}}