please help! Sapling Learning A young work crew is trying to quickly finish some

Question

please help!

Sapling Learning A young work crew is trying to quickly finish some touch-up painting to complete a job. Rather than setting u secure work area, they decide to try a shortcut. Worker A will hold the far end of a 8.49 m work plank which weighs 111 N and is secured with a hinge on the opposite end. Worker B will stand on the plank 4.22 m fronm worker A. Worker B also brings up his paint can, me 3.42 kg, which he places 0.355 m from where he is standing on the plank (belween the two workers) Worker A unfortunately needs to supply 496 N of force to he the end of the plank. How much does worker B weigh? The acceleration due to gravily is g 981 ms Number

Explanation / Answer

Sum the moments about the hinge:

M = 0 = 496 x 8.49 - 111 x (8.49/2) - B (8.49 -4.22) - 3.42 x 9.81 x(8.49 - 4.22 + 0.355)

B x 4.27 = 3584.675 N·m

B = 839.50 N

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