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Examples of Objects in Equilibrium

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The arm in the figure (see attachment) weighs 44.1 N.
The force of gravity acting on the arm acts through point A. Assume that L1 = 0.0890 m, L2 = 0.320 m and alpha = 12.4 degrees.

1.) Determine the magnitude of the tension force Ft in the deltoid muscle.

2.) Determine the magnitude of the tension force Fs of the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown.

3.) Determine the angle of tension force Fs relative to the x-axis.

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The expert examines the examples of onjects in equilibrium. The magnitude of the tension force in the deltoid muscle is determined.

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