A woman is holding a 3.5-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 FD 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 = 1.2 kg, and the mass of the hand is mч= 0.4 kg; all the corresponding weights act at the locations shown in the figure. Deltoid muscle x Answers: FD 3.5(9.81) N 23° WU VWL WH 122 mm 129 mm 414 mm 632 mm- FD= i Ox Oy= = i י N N N Z Z Z
A woman is holding a 3.5-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 FD 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 = 1.2 kg, and the mass of the hand is mч= 0.4 kg; all the corresponding weights act at the locations shown in the figure. Deltoid muscle x Answers: FD 3.5(9.81) N 23° WU VWL WH 122 mm 129 mm 414 mm 632 mm- FD= i Ox Oy= = i י N N N Z Z Z
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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1.3.4
Transcribed Image Text:A woman is holding a 3.5-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
FD 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 = 1.2 kg, and the mass of the
hand is mч= 0.4 kg; all the corresponding weights act at the locations shown in the figure.
Deltoid muscle
x
Answers:
FD
3.5(9.81) N
23°
WU
VWL
WH
122 mm
129 mm
414 mm
632 mm-
FD= i
Ox
Oy=
=
i
י
N
N
N
Z Z Z
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