(II) The Achilles tendon is attached to the rear of the footas shown in Fig. 9–73. When a person elevates himself justbarely off the floor on the “ball of one foot," estimate thetension Fr in the Achilles tendon (pulling upward), andthe (downward) force Fg exerted by the lower leg bone onthe foot. Assume the person has a mass of 72 kg and D istwice as long as d.- Leg boneAchillestendonBall of foot(pivot point)FBFIGURE 9–73Problem 36.

Given human system is of rotational motion. Data given, FT is acting in upward…

Answered: (II) The Achilles tendon is attached to…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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'A model for the elbow joint models the bicep muscle connecting to the horizontal forearm by a vertical tendon 4cm from the elbow joint. A mass m is held in the hand 30cm from the elbow joint. If the maximum tension that can be exerted by the tendon before injury occurs is 2250N, find the maximum mass that can be held in this way.' Im stuck on this question
5. (A). A simple turnbuckle arrangement is constructed from a 40 mm outside diameter tube threaded internally at each end to take two rods of 25 mm outside diameter with threaded ends. What will be the nominal stresses set up in the tube and the rods, ignoring thread depth, when the turnbuckle cames an axial load of 30 kN? Assuming a sufficient strength of thread, what maximum load can be transmitted by the turnbuckle if the maximum stress is limited to 180 MN/m? [39.2, 61.1 MN/m2, 88.4 kN] 6. (A). A bar ABCD consists of three sections: AB is 25 mm square and 50 mm long, BC is of 20 mm diameter and40 mm long and CD is of 12 mm diameter and 50 mm long. Determine the stress set up in each section of the bar when it is subjected to an axial tensile load of 20 kN. What will be the total extension of the bar under this load? For the bar material, E = 210GN/m?. [32.63.7, 176.8 MN/m²_ 0.062mm]
(5) We typically place our arms out for when we are crossing a narrow beam/rope. Is it because: (a) The larger leg muscles are unable to be used so we use the arms for leverage to bring our line of gravity back inside base of support; (b) To make our body area wider so the base of support is wider and line of gravity falls within it; (c) To make our body area wider so center of gravity naturally becomes lower and the body is more stable; (d) To utilize force summation to use larger muscles to bring us back into balance
3
During a circus act, one performer swings upside down hanging from a trapeze holding another, also upside-down, performer by the legs. If the upward force on the lower performer is three times her weight, how much (in m) do the bones (the femurs) in her upper legs stretch? You may assume each is equivalent to a uniform rod 40.0 cm long and 1.74 cm in radius. Her mass is 65.0 kg.
Why is it not possible to sit upright in a chair and rise toyour feet without first leaning forward?
Assume Young’s modulus for bone is 1.40×1010 N/m2 . The bone breaks if stress greater than 1.50 × 109 N/m2 is imposed on it. (i) What is the maximum force that can be exerted on the femur bone in the leg if it has a minimum effective diameter of 2.50 cm? (ii) If this much force is applied compressively, by how much does the 20.0 cm long bone shorten?
A 25-ft chain with a weight of 30 lb is suspended between two points at the same elevation. Knowing that the sag is 10 ft, determine (a) the distance between the supports, (b) the maximum tension in the chain.
A person can safely lie on a bed of nails without hurting herself, compared to stepping accidentally on single protruded nail. Explain
3) To strengthen his arm and chest muscles, a 6-slug athlete who is 6'6" tall is doing push-ups as shown in the figure below. His centre of mass is 3'9" from the bottom of his feet, and the centres of his palms are one foot from the top of his head. Find the force that the floor exerts on each of his feet and on each hand, assuming that both feet exert the same force and both palms do likewise. Begin with a free-body diagram of the athlete. 6'6" K–1'-
As the angle between two concurrent angles decreases, does the magnitude of the force required to produce equilibrium increase, decrease, or the stay the same?

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