Question

A uniform beam 9.00 m long, weighting 300.0 N, rests symmetrically on two supports 5.00 m apart. A boy weighing 600.0 N starts at point A and walks toward the right. (a) Calculate the normal forces at A and B if the value of x shown in the picture is 1.00 m (b) Calculate the normal forces at A and B if the value of x is 1.25m. Do not fail to include the appropriate Free body diagrams.

Answer 1

At Equilibrium NAT NB = W6tWg Tooque about Na=o, . wp x + a* 8. 6 = Nax5 a) a=1m 600x! + 300x2.5 = Nex5 Ne = 270 N] NA= (600 +300 -270) by x = 1.25m [NA 630M Goox1.25'+ 300 x 2.5 E N8x5 WB z 300M NA = (600 + 300 – 300) [NA I GOON