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A steel rotating-beam test specimen has an ultimate strength of 120 kpsi. Estimate the life of the specimen (number of cycles, N) if it

A steel rotating-beam test specimen has an ultimate strength of 120 kpsi. Estimate the life of the specimen (number of cycles, N) if it is tested at a completely reversed stress amplitude of 71 kpsi. Give your answer to 4 significant figures.

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