A person working at a drafting board may hold her head as shown in Figure 9.38, requiring muscle action to support the head. The three major acting forces are shown. Calculate the direction and magnitude of the force supplied by the upper vertebrae F_Vto hold the head stationary, assuming that this force acts along a line through the center of mass as do the weight and muscle force.

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CG W = 50 N 33 Fu 8 F=60 N