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# (Solved): 4. The Derrick Shown Supports A Block Of Granite That Weights 13,300 Lb (i.e. 15 Kip). The Two Steel...

4. The derrick shown supports a block of granite that weights 13,300 lb (i.e. 15 kip). The two steel cables have an allowable stress (Fallow) of 24 ksi. Determine the following: DL. a. Draw the free-body diagram at the point of intersection of the two cable segments and the mast. b. Find the magnitude of the forces in the two cable segments and the mast. c. Identify which members are in compression and which are in tension. d. What minimum diameter cable is required? Round up to the nearest 1/8" diameter. e. Assume the diagonal cable is 120ft long. How much do you expect the diagonal cable to elongate? The Modulus of Elasticity of steel is 29,000 ksi. Use the following equation from Lecture #1: 13.3kip 40Â° S 600 PL AL= AE

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