A young work crew is trying to quickly finish some touch-up painting to complete

Question

A young work crew is trying to quickly finish some touch-up painting to complete a job. Rather than setting up a secure work area, they decide to try a shortcut. Worker A will hold the far end of a 8.98 m work plank which weighs 115 N and is secured with a hinge on the opposite end. Worker B will stand on the plank 4.44 m from worker A. Worker B also brings up his paint can, mc = 3.54 kg, which he places 0.325 m from where he is standing on the plank (between the two workers). Worker A unfortunately needs to supply 4.70

Explanation / Answer

Taking the moment of all the forces about the hinge point...we get : 470 * 8.98 = 115 * (8.98 / 2) + W * 4.54 + 3.54*9.81 * 4.865 So, W = 778.7 N............Answer

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