11.14 A uniform aluminum beam 9.00 m long, weighing 300 N, rests symmetrically on two supports 5.00 m apart (Fig. E11.14

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11 14 A Uniform Aluminum Beam 9 00 M Long Weighing 300 N Rests Symmetrically On Two Supports 5 00 M Apart Fig E11 14 1 (55.8 KiB) Viewed 57 times

11.14 A uniform aluminum beam 9.00 m long, weighing 300 N, rests symmetrically on two supports 5.00 m apart (Fig. E11.14). A boy weighing 600 N starts at point A and walks toward the right. (a) In the same diagram construct two graphs showing the upward forces FA and FB exerted on the beam at points A and B, as functions of the coordinate x of the boy. Let 1 cm = 100 N vertically and 1 cm = 1.00 m horizon- tally. (b) From your diagram, how far beyond point B can the boy walk before the beam tips? (c) 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? Figure E11.14 K A B