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Chapter 9: Q2 CQ (page 314)
Under what conditions can a rotating body be in equilibrium? Give an example.
The total torque is zero and the angular acceleration will be zero and angular velocity remains constant.
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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?
Explain the need for tall towers on a suspension bridge to ensure stable equilibrium.
Question: Unlike most of the other muscles in our bodies, the masseter muscle in the jaw, as illustrated inFigure 9.44, is attached relatively far from the joint, enabling large forces to be exerted by the back teeth. (a) Using the information in the figure, calculate the force exerted by the lower teeth on the bullet. (b) Calculate the force on the joint.
Calculate the magnitude and direction of the force on each foot of the horse inFigure\({\rm{9}}{\rm{.31}}\)(two are on the ground), assuming the center of mass of the horse is midway between the feet. The total mass of the horse and rider is \({\rm{500}}\;{\rm{kg}}\). (b) What is the minimum coefficient of friction between the hooves and ground? Note that the force exerted by the wall is horizontal.
A typical car has an axle with \({\rm{1}}{\rm{.10}}\;{\rm{cm}}\) radius driving a tire with a radius of \({\rm{27}}{\rm{.5}}\;{\rm{cm}}\). What is its mechanical advantage assuming the very simplified model inFigure\({\rm{9}}{\rm{.25}}\)(b)?
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