A uniform bar of AB,2m long weighing 1 kg rest or knife edge o.6 m from A. What weight suspended from A will keep the bar equilibrium..
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The weight 2N of the bar at its midpoint D Let C be the position of the knife edge and W be the suspended at the end A which keeps the bar horizontal . Taking moments about C
W×AC=2×CD
W×0.8=2×1.2
W=
0.8
2×1.2
=3N
To keep the bar horizontal the weight to be suspended is 3N
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