The total mass of the arm shown in is 2.6 kg. determine the force, f_m required of the "deltoid" muscle to hold up the outstretched arm. express your answer to two significant figures and include the appropriate units. determine the magnitude of the force f_j exerted by the shoulder joint on the upper arm. express your answer to two significant figures and include the appropriate units. determine the angle between the positive x axis and the force f_j, measured clockwise. express your answer using two significant figures.
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