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The wheels, axle, and handles of a wheelbarrow weigh W = 59 N. The load chamber

ID: 2192694 • Letter: T

Question


The wheels, axle, and handles of a wheelbarrow weigh W = 59 N. The load chamber and its contents weigh WL = 512 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. (a) F = N (b) F = N

Explanation / Answer

(a) Net moment = 0 Wl*0.4 + (0.2+0.4)*W - F*(0.4+0.2+0.7)= 0 F = 184.77 N (b) Wl*0 + W*0.6 - F*1.3 = 0 F = 27.23 N

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