Kindly answer all.  For Flexural Stress, when we should use the Ix or Iy? Explain, draw diagram if necessary. In designing, the selection of dimension must be the larger one or the smaller? Explain. In identifying capacity, either in terms of load or stress, should it be the larger one or the smaller? Explain.

Steel Design (Activate Learning with these NEW titles from Engineering!)
6th Edition
ISBN:9781337094740
Author:Segui, William T.
Publisher:Segui, William T.
Chapter5: Beams
Section: Chapter Questions
Problem 5.4.3P: Determine the smallest value of yield stress Fy, for which a W-, M-, or S-shape from Part 1 of the...
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Kindly answer all. 

For Flexural Stress, when we should use the Ix or Iy? Explain, draw diagram if necessary.

In designing, the selection of dimension must be the larger one or the smaller? Explain.

In identifying capacity, either in terms of load or stress, should it be the larger one or the smaller? Explain.

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