The conditions for static equilibrium:
Let d be the distance from the second post the boy walks without the beam falling.
The distance between the center of the beam and the second post is (3.0-2.5 = 0.50m). M is the mass of the beam, and m is the mass of the boy.
A 37 kg , 5.0-m-long beam is supported, but not attached to, the two posts in the figure. A 20 kg boy starts walking along the beam.
How close can he get to the right end of the beam without it falling over?
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