Solve the Problem. -The Stiffness of a Rectangular Beam Is Proportional to Its

question 151

Multiple Choice

Solve the problem.
-The stiffness of a rectangular beam is proportional to its width times the cube of its depth. Find the dimensions of the stiffest beam than can be cut from a 13-in.-diameter cylindrical log. (Round answers to the nearest tenth.)

• A) w = 7.5 in.; d = 12.3 in.
• B) w = 7.5 in.; d = 10.3 in.
• C) w = 5.5 in.; d = 12.3 in.
• D) w = 6.5 in.; d = 11.3 in.

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