Question

A 70 kg man stands at the end of a 12 m long platform. The end opposite
to the man rests on the edge of a wall, and a support column is located a
distance d = 3 m from the end with the man. The platform itself has a mass
of 300 kg. (a) How much weight does the column support? (That is, what is
the normal force on the platform from the column?) (b) How massive must
the man be in order for the opposite end of the platform to lift off of the
wall?
A sturdy wooden board, 4.0 meters long and with a mass of 32 kg, rests on two supports (labeled L and R) placed 1.2 m from each end as shown in the figure below. (a) Suppose that a man with a mass of 60 kg stands at the center of

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