Question

Please ignore my answer, it is incorrect

2. The 400N child now wants to seesaw alone. To do so, she moves the plank so that its center of weight is no longer directly above the fulcrum. She finds she will be balanced when she is 0.75m to the left of the fulcrum and the center of the plank is 0.50m to the right of the fulcrum. What is the weight of the plank? a. 150N 267N b. C. 300N d. 450N e. 600N

Answer 1

Torque balance about fulcrum

torque by child=torque by plank

400*0.75=0.5*W

W=600N