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01-20-2017, 12:44 PM
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#1
a) If the area of the first cervical vertebra, which the head restson, is 5 cm2 if the force = 64N, find the stress(force per unit area) on it.
(b) What is this stress for a 66 kg person standing on his head? How does this stress compare with the maximum compression
strength for bones(1.7 x 10^8 N/m2 )
stress, .
ˡ 1%
[ (a) The stress is 64/5 x 10-4 or 1.28 x 103 N/m2.
b) The mass is 66 kg, and the stress is
N/m2 ) 1.3*10^6 = ( 5*10^-4 ) /(66*9.8)
10 which is less than 1% of the maximum compression strength
: Medical Physics , John R Cameron and James G Skofronick"
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