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Question: 
  1. Calculate the magnitude of the force, $F_M$, required of the “deltoid” muscle to hold up the outstretched arm shown in Fig. 9–72. The total mass of the arm is 3.3 kg.
  2. Calculate the magnitude of the force $F_J$ exerted by the shoulder joint on the upper arm and the angle (to the horizontal) at which it acts.
Problems 34 and 35.

Figure 9-72.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 
  1. $250 \textrm{ N}$
  2. $240 \textrm{ N, } 7.6^\circ \textrm{ below horizontal}$

Giancoli 7th Edition, Chapter 9, Problem 34

(3:31)

Chapter 9, Problem 34 is solved.

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