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MathNet 2012 Question 43

Math Olympiad Vault · MathNet 2012

Question 43

Disks $A,B,C,D$ represent pulleys with diameters $8,4,6,2\,\mathrm{cm}$, respectively, joined by belts that move without slipping. When disk $A$ makes one complete clockwise revolution, what happens to disk $D$?

Question illustration

A) It makes 4 clockwise revolutions
B) It makes 3 clockwise revolutions
C) It makes 6 counterclockwise revolutions
D) It makes 4 counterclockwise revolutions
E) It makes 3 counterclockwise revolutions