Minimum effective cross-sectional area
The maximum applied force of compression that one man's thighbone can endure without breaking is 6.50 104 N. The minimum effective cross-sectional area of the bone is 4.30 10-4 m2, its length is 0.59 m, and Young's modulus is Y = 9.4 109 N/m.
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Express your answer in terms of the cylinder's radius r and the magnitude of the acceleration due to gravity g.
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