A 20.0-m-long uniform beam weighing 550 N rests on walls A and B, as shown in Fig

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A 20.0-m-long uniform beam weighing 550 N rests on walls A and B, as shown in Fig 9-80
(a) Find the maximum weight of a person who can walk to the extreme end D without tipping the beam. Find the forces that the walls A and B exert on the beam when the person is standing:
(b) and D;
(c) At a point 2.0 m to the right of B; (cd) 2.0 m to the right of A.


20.0 m A 3.0 m 12.0 m
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