Q1) A man is pulling a spring of stiffness coefficient 8 Ib/in by his hand with the entire arm held horizontallyrotating about shoulder joint O; this force acts at the 21° angle is shown. Determine the force exerted by thedeltoid muscle on the upper arm at A and x- and y- components of the force reaction at the shoulder joint. Theweight 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 fromA- 8 IbinEquilibriumx-1 inDeltoid muscleFoAYW,YW-5.216.525.4Figure 1

Draw a labeled free-body diagram of the given system. Calculate the force due to spring, Fs=k×x=8…

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.

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.

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter5: Three-dimensional Equilibrium

Section: Chapter Questions

Problem 5.42P: The 350-lb homogeneous plate has the shape of an isosceles triangle. The plate is supported by a...

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