an 80-kg man is sitting on the right side of the plank, 1.25m away from the fulcrum. While on the left side of the plank, a 30-kg girl and a 20-kg boy are both seated 2.00 and 1.75m 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, 0.5m away from the fulcrum.  Use the second condition for equilibrium to find the Torques of objects A and C.

College Physics
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ISBN:9781305952300
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Chapter1: Units, Trigonometry. And Vectors
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an 80-kg man is sitting on the right side of the plank, 1.25m away from the fulcrum. While on the left side of the plank, a 30-kg girl and a 20-kg boy are both seated 2.00 and 1.75m 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, 0.5m away from the fulcrum. 

Use the second condition for equilibrium to find the Torques of objects A and C.

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using the equation that shows the relationship of masses of objects A and C, find the masses of both objects

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