
Physics
Properties of matter Solutions
Questions
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Review Constants 1 Periodic Table
Part A
Larger animals have sturdier bones than smaller
animals. A mouse's skeleton is only a few percent
of its body weight, compared to 16% for an
elephant. To see why this must be so, recall, that
the stress on the femur for a man standing on one
leg is 1.4% of the bone's tensile strength. Suppose
we scale this man up by a factor of 10 in all
dimensions, keeping the same body proportions.
(Assume that a 70 kg person has a femur with a
cross-section area (of the compact bone) of
4.8 x 10-4 m², a typical value.)
Both the inside and outside diameter of the femur, the region of compact bone, will increase
by a factor of 10. What will be the new cross-section area?
Express your answer with the appropriate units.
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