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Desperate for help -- studying an angular motion problem

  1. Dec 30, 2014 #1
    hi folks, my back story is that I have failed my strength of materials and dynamics twice. the college I am attending put these courses in an accelerated time frame... this means 14 weeks of material turned into 7 weeks of material. I am not able to learn at that pace, hence why I failed twice.

    I am not in these courses right now, but am trying to grasp the concepts so it doesnt happen again.

    currently I am trying determine the force acting into a reciever when a slender rod with a mass of .033KG rotates 15degrees in 60 seconds and comes to a complete stop. the radius of rotation is .2542m

    my calculations:
    Omega=(theta)/t
    =15/60
    =.25 <<--------is this correct?

    with this I can determine my angular acceleration:
    (alpha)=dw/dt
    =.25/60
    =.0042 rad/s²

    not sure what calculation to goto next. I have tried the parallel axis, I have tried the KE equation... not sure which path to take. this is where it gets REALLY FOGGY!

    this is about as much as I picked up in class as the rest of this process is a complete blur... any help would be GREATLY appreciated.

    -drew
     
  2. jcsd
  3. Dec 30, 2014 #2
    I want to master the process so please just advise me on what formula to use and which element I am solving for.

    i.e.) use the parallel axis theorum to solve for Ig
     
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