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
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
4th Edition
ISBN:9781305501607
Author:Andrew Pytel And Jaan Kiusalaas
Publisher:Andrew Pytel And Jaan Kiusalaas
Chapter4: Coplanar Equilibrium Analysis
Section: Chapter Questions
Problem 4.41P: The center of gravity of the 3000-lb car is at G. The car is parked on an incline with the parking...
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