Chapter 9: Q27PE (page 317)
Two muscles in the back of the leg pull on the Achilles tendon as shown inFigure\({\rm{9}}{\rm{.37}}\). What total force do they exert?
The total force is \({\rm{376}}\;{\rm{N}}\) with upward direction.
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Explain why the forces in our joints are several times larger than the forces we exert on the outside world with our limbs. Can these forces be even greater than muscle forces (see previous Question)?
If the maximum force the biceps muscle can exert is , can we pick up an object that weighs? Explain your answer.
Why are the forces exerted on the outside world by the limbs of our bodies usually much smaller than the forces exerted by muscles inside the body?
(a) What force must be exerted by the wind to support a \({\rm{2}}{\rm{.50}}\;{\rm{kg}}\)chicken in the position shown inFigure\({\rm{9}}{\rm{.33}}\)? (b) What is the ratio of this force to the chicken’s weight? (c) Does this support the contention that the chicken has a relatively stable construction?
Suppose the biceps muscle was attached through tendons to the upper arm close to the elbow and the forearm near the wrist. What would be the advantages and disadvantages of this type of construction for the motion of the arm?
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