Concept explainers
Ruby, with mass 55.0 kg, is trying to reach a box on a high shelf by standing on her tiptoes. In this position, half her weight is supported by the normal force exerted by the floor on the toes of each foot as shown in Figure P14.75A. This situation can be modeled mechanically by representing the force on Ruby’s Achilles tendon with
FIGURE P14.75
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Physics for Scientists and Engineers: Foundations and Connections