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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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If the maximum force the biceps muscle can exert is , can we pick up an object that weighs? Explain your answer.
Question: Even when the head is held erect, as inFigure 9.41, its center of mass is not directly over the principal point of support (the atlantooccipital joint). The muscles at the back of the neck should therefore exert a force to keep the head erect. That is why your head falls forward when you fall asleep in the class. (a) Calculate the force exerted by these muscles using the information in the figure. (b) What is the force exerted by the pivot on the head?
Mechanics sometimes put a length of pipe over the handle of a wrench when trying to remove a very tight bolt. How does this help? (It is also hazardous since it can break the bolt.)
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.
Use the second condition for equilibrium(net )to calculateinExample 9.1, employing any data given or solved for in part (a) of the example.
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