A uniform, aluminum beam 9.00 m long, weighting 300 N, rests symmetrically on two supports 5.00 m apart. A boy weighing 600 N starts at point A and walks toward the right. (Figure 1)
How far beyond point B can the boy walk before the beam tips?
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How far from the right end of the beam should support B be placed so that the boy can walk just to the end of the beam without causing it to tip?