A light plank 2 meters long rests on two scales with a girl laying across the plank. The mass on the left(head) is 380N and at the other end(feet), the mass is 320N. How far from the girl's feet is the center of mas?
net F = 0
net T = 0
because this object is in equillibrium so all torque/forces equal zero
The Attempt at a Solution
I have free body diagrams containing total forces. I just look at this as if there are 2 blocks instead of a body.
m1g + m2g=0
m1g (2-x) + m2g(2-x)=0 i know for torque i need the force to be multiplied by some distance.
would the mass of the plank matter? that would be another unknown that i'm not even sure i could solve for. do i need to choose an rotation point?