an 80-kg man is sitting on the right side of the plank, 0.75 away from the fulcrum. While on the left side of the plank, a 30-kg girl and a 20-kg boy are both seated 1.50m and 2.00m away from the fulcrum, respectively. A mystery object C is also placed on the left side of the plank with a lever arm of 1.0m. To make the system in equilibrium, another mystery object A is placed on the right side of the plank, 2.00m away from the fulcrum.  Use the second condition for equilibrium to arrive at equations showing t

College Physics
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ISBN:9781305952300
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Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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an 80-kg man is sitting on the right side of the plank, 0.75 away from the fulcrum. While on the left side of the plank, a 30-kg girl and a 20-kg boy are both seated 1.50m and 2.00m away from the fulcrum, respectively. A mystery object C is also placed on the left side of the plank with a lever arm of 1.0m. To make the system in equilibrium, another mystery object A is placed on the right side of the plank, 2.00m away from the fulcrum. 

Use the second condition for equilibrium to arrive at equations showing the relationship of the masses of mystery objects A and C, then find their masses using the equations.

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what is the torque of mysterious object A and mysterious object C so that the summation of torques is zero?

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why is gravity not included in the equation? We know that Force = mass x gravity and the formula for Torque is T= Force x lever arm.  

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what is the mass of mystery objects A and C?

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