a)Calculate the bone shear force acting on the lumbar vertebra. Report the force in units of N
b)Calculate the bone compressive force acting on the lumbar vertebra.
c)Calculate the back extensor force (Fm) required to keep the trunk in the static position as shown. Report Fm, in units of N
The weight of the trunk (Wtrunk) is 500 N, and it has a moment arm of 0.10 m.
The weight of the arms (Warms) is 50 N, and it has a moment arm of 0.50 m.
The horizontal force from the wall (Fwall-x) is 25 N, and it has a moment arm of 0.25 m.
The vertical force from the wall (Fwall-y) is 50 N, and it has a moment arm of 0.75 m.
The weight of the backpack (Wpack) is 25 N, and it has a moment arm of 0.15 m.
The back extensor muscle has a moment arm of 0.05 m.
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