Solved: The Iron Cross When a gymnast weighing 750 N
Chapter 8, Problem 8.139(choose chapter or problem)
The Iron Cross When a gymnast weighing 750 N executes the iron cross as in Figure P8.85a, the primary muscles involved in supporting this position are the latissimus dorsi (lats) and the pectoralis major (pecs). The rings exert an upward force on the arms and support the weight of the gymnast. The force exerted by the shoulder joint on the arm is labeled F S s while the two muscles exert a total force F S m on the arm. Estimate the magnitude of the force F S m. Note that one ring supports half the weight of the gymnast, which is 375 N as indicated in Figure P8.85b. Assume that the force F S m acts at an angle of 45 below the horizontal at a distance of 4.0 cm from the shoulder joint. In your estimate, take the distance from the shoulder joint to the hand to be 70 cm and ignore the weight of the arm.
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