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18.
 The wheels, axle, and handles of a
wheelbarrow weigh 60.0 N. The load chamber and its contents weigh 525 N. The
drawing shows these two forces in two different wheelbarrow designs. To
support the wheelbarrow in equilibrium, the man’s hands apply a force  to the handles that is
directed vertically upward. Consider a rotational axis at the point
where the tire contacts the ground, directed perpendicular to the plane of
the paper. Find the magnitude of the man’s force for both designs.
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