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When a patient’s injured neck is healing, it is often desirable to prevent the weight of the head from pushing down on the neck. This can be accomplished with the system of pulleys shown in the figure. The pulleys are all small and extremely light in weight and have no appreciable friction. Typically, a person’s head makes up 7.00% of his or her body weight.

If the head of a 63.0 kg person is to be supported completely by the apparatus shown, what should the mass of W be? Start with a free-body diagram of the head.

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    without the diagram of the apparatus, it is not possible.

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