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//Minimum horizontal force required to avoid slipping
//refer fig.5.15
//consider equilibrium
//taking moment about A
//0.866*NB+0.5*FB=275
//Law of friction
//FB=0.2*NB
//Thus
NB=275/(0.866+0.5*0.2) //N
NA=200+600-56.934 //N
FA=0.3*NA //N
P=NB-FA //N
printf("The required force is P=%0.2d N",P)
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