Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
-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 cylindrical log. (Round answers to the nearest tenth.)

A) w = 6.0 in.; d = 7.7 in.
B) w = 4.0 in.; d = 9.7 in.
C) w = 6.0 in.; d = 9.7 in.
D) w = 5.0 in.; d = 8.7 in.