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OpenStudy (anonymous):
An inventive child named Nick wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley (see figure below), Nick pulls on the loose end of the rope with such a force that the spring scale reads 320 N. Nick's true weight is 250 N, and the chair weighs 160 N. Nick's feet are not touching the ground.
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