I have no idea what to do for this type of question. Please show me step by step

Question

I have no idea what to do for this type of question. Please show me step by step how to get the right answer.

1. -1 points OSColPhys2016 9.2 P004 )My Notes The two children shown in the figure below are balanced on a seesaw of negligible mass. The first child has a mass of 21.3 kg and sits 1.29 m from the pivot. The second child has a mass of 33.7 kg and sits 0.815 m from the pivot. Use the second condition for equilibrium (net 0) to calculate Fp, the supporting force (in N) exerted by the pivot. (Enter the magnitude.) m2 Additional Materials Reading

Explanation / Answer

net torque about the first child = 0

torque due to Fp = Fp*r1   ( counter clockwise)

torque due to W = -W2*(r1+r2)   ( clockwise)

net torque = 0

Fp*r1 - W2*(r1+r2) = 0

Fp*1.29 - (33.7*9.8*(1.29+0.815)) = 0

Fp = 538.9 = 539 N <<<---ANSWER

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