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Homework Statement
The information is on the attachment
the plank is uniform meaning the mass of the plank is uniformly spread so the center of gravity is in the mid point of the plank.The plank is in equilibrium.Find the weight of the plank,Let the weight be w.
Homework Equations
torque-f1d1=f2d2
The Attempt at a Solution
15*0.5=w*0.3
so weight is 25N
Question
But my question is the center of gravity is taken by considering the torques on the sides of it to cancel.But one piece of the plank is on the other side of the pivot.so the force on the right side cannot be taken as the center of the gravity because on piece of the plank belongs to the left side.But in my textbook it was solved by the method above.What method is right?