force acts at the 21° angle shown. Determine the force exerted by the deltoid muscle on the upper arm at A and the x- and y-components of the force reac- tion at the shoulder joint O. The weight of the upper

Elements Of Electromagnetics
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A woman is holding an 8-lb weight in her hand with
the entire arm held horizontally as shown in the fig-
ure. A tensile force in the deltoid muscle prevents the
arm from rotating about the shoulder joint O; this
force acts at the 21 angle shown. Determine the
force exerted by the deltoid muscle on the upper arm
at A and the x- and y-components of the force reac-
tion at the shoulder joint O. The weight of the upper
arm is Wy 4.1 lb, the weight of the lower arm is
W. = 2.4 lb, and the weight of the hand is WH =
0.9 lb; all these weights act at the locations shown in
the figure.
8 lb
Deltoid muscle
5-YW
5.2
WH
16.5"
25.4"
Transcribed Image Text:A woman is holding an 8-lb weight in her hand with the entire arm held horizontally as shown in the fig- ure. A tensile force in the deltoid muscle prevents the arm from rotating about the shoulder joint O; this force acts at the 21 angle shown. Determine the force exerted by the deltoid muscle on the upper arm at A and the x- and y-components of the force reac- tion at the shoulder joint O. The weight of the upper arm is Wy 4.1 lb, the weight of the lower arm is W. = 2.4 lb, and the weight of the hand is WH = 0.9 lb; all these weights act at the locations shown in the figure. 8 lb Deltoid muscle 5-YW 5.2 WH 16.5" 25.4"
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