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Determine the smallest allowable cross-sectional areas of members CE, BE, and EF for the truss shown. The working stresses are 20 ksi in tension

Determine the smallest allowable cross-sectional areas of members CE, BE, and EF for the truss shown. The working stresses are 20 ksi in tension and 14 ksi in compression. (The working stress in compression is smaller to reduce the danger of buckling.) 18 ft 000 30 kips 30 kips 48 ft B 8ft Csf D E

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