21. A uniform 18 kg beam hinged at P is held horizontal by a vertical string that can withstand a maximum tension of 350 N. A 5.0 kg mass is suspended from the end of the beam as shown. At what minimum distance, x, can the string be attached without breaking?

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Q: 6 m 3 m 3m 30 kN 4 m F 4 m 4 m H. 4 m A B Figure (a)

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A: lfloadP3=10 kipscompressivelengthL3=3+4+3L3=10 ftFirstly check for equilibrium, i.e. sum of left…

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Q: 10 mm L2 = 460 mm L3 = 690 m

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