Given the figure below of a system in static equilibrium

QUESTION

Given the figure below of a system in static equilibrium, determine the mass (in kilograms) of the purple ball. The long plank is length, L, and A is 40.0% of L. The weight of the long (uniform) plank is 4.00 N. The downwards force that is being applied at the orange arrow is 15.0 N. The distance from the support on the right to the purple ball is one-third of L. Finally, the upwards force of the support on the right on the plank is 7.00 N.

ANSWER:

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