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//find necessary effort
//effective wheel diameter
D=(6/2)+500+(6/2) //mm
//effective axle diameter
d=(20/2)+200+(20/2) //mm
VR=D/d
eta=0.7
MA=eta*VR
W=1200
P=1200/1.63 //N
printf("The effort necessary=%.2f N",P)
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