A 700 athlete standing on one foot on a very smooth gym floor lifts his body by

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A 700 athlete standing on one foot on a very smooth gym floor lifts his body by pivoting his foot upward through a 30.0 angle, balancing all of his weight on the ball of the foot. The forces on the foot bones from the rest of his body are due to the Achilles tendon and the ankle joint. (See the figure below (Figure 1) .) The Achilles tendon acts perpendicular to a line through the heel and toes; it is this line that has rotated upward through 30.0. Assume that the weight of the foot is negligible compared with that of the rest of the body.

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