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Trigonometry Two pulleys


New member
Jan 31, 2019
Hello there, i need some help on my homework. there's no given numbers that's why it's hard for me to answer this one.

Two pulleys with radii r1 and r2 rotate at angular speeds of w1 and w2. if the pulleys are connected by a belt, show that r1/r2=w2/w1


Well-known member
MHB Math Scholar
Jan 30, 2012
Use the fact that the length of the belt moved past each pulley in any period of time is the same for both pulleys.