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Unformatted text preview: have the highest stresses. c. Finally you can compare the maximum stress in each one of the three sections and conclude which section is most effective (has the lowest stresses). 2. Problem 4.5. To help you know if you are getting the right answers, note that (to two digit accuracy) the three moments of inertia are 24,000, 87,000 and 15,000 all in cm 4 . The stress in stringer 1 (upper left) comes out to be 1202 N/cm 2 . Check that the sum of the forces in the four stringers is zero, and explain why it should be. 3. Problem 4.6....
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 Fall '09
 Kim

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