SOLUTION: The stiffness of a rectangular beam is proportional to the breadth and the cube of the depth. Find the breadth of the stiffness beam that can be cut from a log of radius 10 inches.

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Question 1122182: The stiffness of a rectangular beam is proportional to the breadth and the cube of the depth. Find the breadth of the stiffness beam that can be cut from a log of radius 10 inches.
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
Draw this out, and the wood is a square with 20 inches diameter with side 20 sqrt (2)/2 for a square. The total breadth/depth is 10 sqrt(2), the side of the square.
14.14 inches