Chapter 9: Q3 CQ (page 314)
What three factors affect the torque created by a force relative to a specific pivot point?
Short Answer
The three factors are the force, the radius of rotation and the angle between the force and the radius of rotation.
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Chapter 9: Q3 CQ (page 314)
What three factors affect the torque created by a force relative to a specific pivot point?
The three factors are the force, the radius of rotation and the angle between the force and the radius of rotation.
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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.
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?

Suppose we replace the 4.0kg book inExercise 9.31of the biceps muscle with an elastic exercise rope that obeys Hooke’s Law. Assume its force constant k = 600N/m. (a) How much is the rope stretched (past equilibrium) to provide the same force FB as in this example? Assume the rope is held in the hand at the same location as the book. (b) What force is on the biceps muscle if the exercise rope is pulled straight up so that the forearm makes an angle of 25owith the horizontal? Assume the biceps muscle is still perpendicular to the forearm.
What can you say about the velocity of a moving body that is in dynamic equilibrium? Draw a sketch of such a body using clearly labeled arrows to represent all external forces on the body.
Question: (a) What force should the woman inFigure 9.45exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed. (b) The triceps muscle at the back of her upper arm has an effective lever arm of 1.75cm, and she exerts force on the floor at a horizontal distance of 20.0cm from the elbow joint. Calculate the magnitude of the force in each triceps muscle, and compare it to her weight. (c) How much work does she do if her center of mass rises 0.240m? (d) What is her useful power output if she does 25pushups in one minute?

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