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Belt drive problem

  1. Oct 16, 2007 #1
    1. The problem statement, all variables and given/known data

    Wheel A of radius ra = 6.5 cm is coupled by belt B to wheel C of radius rc = 32.8 cm. Wheel A increases its angular speed from rest at time t = 0 s at a uniform rate of 6.2 rad/s2. At what time will wheel C reach a rotational speed of 108.3 rev/min, assuming the belt does not slip?

    2. Relevant equations
    a=alpha x radius
    wf=w(initial)+ alpha x time

    3. The attempt at a solution

    I used a=alpha x radius, twice to solve for alpha of ra and rc and then i want to use the wf=w(initial) +alpha x time..but which alpha do I use, ra or rc?
  2. jcsd
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