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//machine efficiency and effort lost in friction
//For third order system of pulleys
W=1000
VR=(2^3)-1
eta=(1000*100)/(180*7) //percent
//ideal effort
Pi=(W)/(VR) //N
P=180 //N
//effort lost in friction
Pl=P-Pi //N
printf("Efficiency=%.2f percent\nEffort lost in friction=%.2f N",eta,Pl)
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