Sunday, August 2, 2009

Moments maths! I can't do part C!!!!!!!!!!!!!?

A plank AB of length 6.5m and weight 800 N is supported horizontally by two vertical forces acting at points X and Y on the plank. AX = 0.8 m, YB = 2.1 m and the centre of mass of the plank is at G, where AG = 3.5 m. A boy of weight 450N stands at A and then walks slowly towards B. Calculate:


(a) the forces at Y and X when the boy is standing at A


(b) the forces at Y and X when the boy is standing at the point Y


(c) the distance the boy has walked from A when the plank


starts to tip.





help with part C!!!!!!!!

Moments maths! I can't do part C!!!!!!!!!!!!!?
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