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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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When opening a door, you push on it perpendicularly with a force of 55.0 N at a distance of 0.850 m from the hinges. What torque are you exerting relative to the hinges? (b) Does it matter if you push at the same height as the hinges?
A gymnast is attempting to perform splits. From the information given in Figure \({\rm{9}}{\rm{.36}}\), calculate the magnitude and direction of the force exerted on each foot by the floor.
Question: A person working at a drafting board may hold her head as shown inFigure 9.40, requiring muscle action to support the head. The three major acting forces are shown. Calculate the direction and magnitude of the force supplied by the upper vertebrae Fvto hold the head stationary, assuming that this force acts along a line through the center of mass as do the weight and muscle force.
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?
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)?
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