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Pulley Problems with Rotation please help!

  1. Mar 7, 2010 #1
    1. Wheel A of radius 10 cm is coupled by belt B to a wheel C of radius 25 cm. Wheel A increases its angular speed from rest at a uniform rate of 1.6 rad/s^2. Determine the ime required for wheel C to reach a rotational speed of 100 rev/min, assuming the belt does not slip



    2. I'm very confused by what exactly I have to solve for first. I know that I have to use the 5 equations of motion (with the rotation variables subbed in for the linear ones) but I'm still not sure.



    3. I thought that since the radius of C is A*2.5, I thought about solving for A, and then multiplying by 2.5, but I don't know... Can someone please show me how to do it?
     
  2. jcsd
  3. Mar 7, 2010 #2
    by coupled, it means that the two wheels are connected by a belt that goes around them, like a rubber band.
     
  4. Mar 7, 2010 #3
    wf^2-wi^2=2a(theta) is what i'm thinking of using, but I don't know where to get (theta) in relation to the radius. i know that theta r = d, but theres no "d"

    :(
     
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