A uniform plank 10m long and of mass 40kg is supported by two posts...?
A uniform plank 10m long and of mass 40kg is
supported by two posts, the first 1m from the left
end and the other 6m from the left end. A mass of
10kg is placed 8m from the left end. Find the force
each of the support posts exerts on the plank if it is
I'm not looking for just an answer. I would appreciate it you could tell me what needs to be done.
Here is the illustration that goes along with the question. http://i55.tinypic.com/2s61zj8.png
T= F x ℓ
The Attempt at a Solution
Torque on the left: T = F2 x 1m (CCW)
Torque on the plank: T = -400N x 5m (CW)
Torque by the weight T= -100N x 7m (CW)
I really don't know where to go on from there. This is my first year in physics and i'm having trouble.