QI) A man is pulling a spring of stiffness coefficient 8 Ib/in by his hand with the entire arm held horizontally the spring extended 1 in only as shown in figure 1. A tensile force in the deltoid muscle prevents the arm from rotating about shoulder joint O; this force acts at the 21° angle is shown. Determine the force exerted by the deltoid muscle on the upper arm at A and x- and y- components of the force reaction at the shoulder joint. The weight of the upper arm Wy = 4.1 Ib, the weight of the lower arm W1, = 2.4 Ib, and the weight of the hand WH= 0.9 Ib; all these weights act at the locations shown in the figure.

Elements Of Electromagnetics
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Q1) A man is pulling a spring of stiffness coefficient 8 Ib/in by his hand with the entire arm held horizontally
rotating about shoulder joint O; this force acts at the 21° angle is shown. Determine the force exerted by the
deltoid muscle on the upper arm at A and x- and y- components of the force reaction at the shoulder joint. The
weight of the upper arm Wu = 4.1 Ib, the weight of the lower arm W1 2.4 Ib, and the weight of the hand WH=
0.9 Ib; all these weights act at the locations shown in the figure.
the spring extended 1 in only as shown in figure 1. A tensile force in the deltoid muscle prevents the arm from
A- 8 Ibin
Equilibrium
x-1 in
Deltoid muscle
Fo
A
YW,
YW
-5.2
16.5
25.4
Figure 1
Transcribed Image Text:Q1) A man is pulling a spring of stiffness coefficient 8 Ib/in by his hand with the entire arm held horizontally rotating about shoulder joint O; this force acts at the 21° angle is shown. Determine the force exerted by the deltoid muscle on the upper arm at A and x- and y- components of the force reaction at the shoulder joint. The weight of the upper arm Wu = 4.1 Ib, the weight of the lower arm W1 2.4 Ib, and the weight of the hand WH= 0.9 Ib; all these weights act at the locations shown in the figure. the spring extended 1 in only as shown in figure 1. A tensile force in the deltoid muscle prevents the arm from A- 8 Ibin Equilibrium x-1 in Deltoid muscle Fo A YW, YW -5.2 16.5 25.4 Figure 1
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