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They are supporting the same weight Look at torque about center: +FR L – FL L/2 = 0 FR= ½ FLįA FB 1 meter 0.5meter mg Mg Homework 8 Hints A 75 kg painter stands at the center of a 50 kg, 3 meter plank. The person on the right is supporting the greatest weight 3.
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The person on the left is supporting the greatest weight 2. Which of the two people is supporting the greatest weight? 1. ”ĬORRECT FL FR L L/2 mg Preflight The picture below shows two people lifting a heavy log. They are supporting the same weight “assume r for F1(person on the left to the log) is 1/4R, then after calculation i get F1=2F2” “The guy on the left has to support more weight because he is further in and has to support more of the board. Pivot Center of mass pivot d Center of mass W=mg Torque about pivot = 0 Torque about pivot 0 Static Equilibrium Not in equilibrium Equilibrium A method to find center of mass of an irregular objectĬORRECT Preflight The picture below shows two people lifting a heavy log. Torque about pivot due to gravity t = mgd (non-zero!).Balance Demo S t = 0 9.8 (0.5) – (19.6)d = 0 d = 25Ĭenter of mass pivot d W=mg Static Equilibrium and Center of Mass Where do you need to place a 2 kg weight to balance it? A) x = 25ě) x=50Ĝ) x=75ĝ) x=100 E) 1 kg can’t balance a 2 kg weight.
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