Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Dynamics homework problem

  1. Dec 15, 2007 #1
    1. The problem statement, all variables and given/known data

    please see attached picture.

    2. Relevant equations

    a(sub b)=a (sub a) + a (sub b/a)n + a (sub b/a)t
    a (sub b/a)n=0 b/c originally at rest
    a(sub b)=r(sub b)*alpha(b)
    therefore:
    r(sub b)*alpha(b)=a(sub a to the right) + 6*alpha(sub ab to 45 degrees, right up)
    x direction: 1m*alpha(sub b)=10+6alpha(ab)cos45
    y direction: 0=0+6alpha(sub b)*sin(45)
    alpha(ab)=0; alpha(sub b)=10 rad/s^2

    sum of moments (clockwise positive)
    =-2g(3sin(45))+10(6sin(45))=I(sub G)*alpha(sub ab)+ma(sub G)*3sin(45)
    a(sub G,ab)=0.19m/s^2 to the right


    3. The attempt at a solution

    is this right? it seems tooooo easy. thanks ahead of time!
     

    Attached Files:

    • 4.JPG
      4.JPG
      File size:
      31 KB
      Views:
      129
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted