3 weights

A two-arm lever has a 0.5 kg weight on the left arm at a distance of 64 cm from the axis of rotation and a 0.8 kg weight at a distance of 30 cm from the axis of rotation. How far on the right arm must the 0.7 kg weight be placed for the lever to be in balance?

Correct answer:

r =  0.8 m

Step-by-step explanation:

m1=0.5 kg l1=64 cm m=64:100  m=0.64 m m2=0.8 kg l2=30 cm m=30:100  m=0.3 m m3=0.7 kg g=9.81 m/s2  M1+M2=M3 F1 l1+F2 l2=F3 r m1 g l1+m2 g l2=m3 g r m1 l1+m2 l2=m3 r  r=m3m1 l1+m2 l2=0.70.5 0.64+0.8 0.3=0.8 m



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