1. What kinds of fractures are produced only by combined loading? (Identify fracture types with their associated causative loadings.)
2. Approximately 56% of body weight is supported by the fifth lumbar vertebra. How much stress is present on the 22 cm2 surface area of that vertebra in an erect 756 N man? (Assume that the vertebral surface is horizontal.) (Answer: 19.2 N/cm2 )
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