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. You are leaning your head over your tissue mechanics book to study as shown in the diagram below. E is the erector spinae force, H assume 10% of your body weight from anthropometry tables) is the weight of the head and neck acting downward at their combined center of gravity, and R is the vertebral reaction force acting at a center of pressure on the inferior end plate of C5. Determine the muscle force E and the magnitude and direction of the joint reaction force R. Assume that E is parallel to the spine and θ-70. Let the perpendicular moment arms of E and H with respect to the point of action of R be 0.02 and 0.10 m, respectively. 1.
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