A woman is holding a 2.8-kg sphere in her hand with the entire arm held horizontally as shown in the figure. A tensile force in the deltoid muscle prevents the arm from rotating about the shoulder joint O; this force acts at the 23° angle shown. Determine the force Fp exerted by the deltoid muscle on the upper arm at A and the x- and y-components of the force reaction at the shoulder joint O (positive to the right and up). The mass of the upper arm is my= 2.0 kg, the mass of the lower arm is m= 1.0 kg, and the mass of the hand is mH= 0.4 kg; all the corresponding weights act at the locations shown in the figure. Answers: FD- i Ox= Oy i i Deltoid muscle FD 23° 120 mm 125 mm396 mm- WU 600 mm- WL N Z Z Z N N 2.8(9.81) N YWH

International Edition---engineering Mechanics: Statics, 4th Edition
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Chapter4: Coplanar Equilibrium Analysis
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A woman is holding a 2.8-kg sphere in her hand with the entire arm held horizontally as shown in the figure. A tensile force in the
deltoid muscle prevents the arm from rotating about the shoulder joint O; this force acts at the 23° angle shown. Determine the force
Fp exerted by the deltoid muscle on the upper arm at A and the x- and y-components of the force reaction at the shoulder joint O
(positive to the right and up). The mass of the upper arm is my= 2.0 kg, the mass of the lower arm is m₁= 1.0 kg, and the mass of the
hand is mH= 0.4 kg; all the corresponding weights act at the locations shown in the figure.
Answers:
FD= i
Ox=
Oy=
i
i
Deltoid muscle
FD
A
23°
WU
120 mm
125 mm
396 mm-
y
600 mm-
WL
N
N
Z Z
N
2.8(9.81) N
WH
Transcribed Image Text:A woman is holding a 2.8-kg sphere in her hand with the entire arm held horizontally as shown in the figure. A tensile force in the deltoid muscle prevents the arm from rotating about the shoulder joint O; this force acts at the 23° angle shown. Determine the force Fp exerted by the deltoid muscle on the upper arm at A and the x- and y-components of the force reaction at the shoulder joint O (positive to the right and up). The mass of the upper arm is my= 2.0 kg, the mass of the lower arm is m₁= 1.0 kg, and the mass of the hand is mH= 0.4 kg; all the corresponding weights act at the locations shown in the figure. Answers: FD= i Ox= Oy= i i Deltoid muscle FD A 23° WU 120 mm 125 mm 396 mm- y 600 mm- WL N N Z Z N 2.8(9.81) N WH
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