1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Finding angular acceleration of 2 masses on a rod

  1. Apr 29, 2010 #1
    1. The problem statement, all variables and given/known data

    A uniform rigid rod with mass Mr = 5.9 kg, length L = 2.9 m rotates in the vertical xy plane about a frictionless pivot through its center. Two point-like particles m1 and m2, with masses m1 = 5.7 kg and m2 = 1.8 kg, are attached at the ends of the rod. What is the magnitude of the angular acceleration of the system when the rod makes an angle of 42.7° with the horizontal?

    2. Relevant equations

    all i know is that I= 1/12ML^2

    3. The attempt at a solution

    I honestly dont know where to star, could anyone guide me towards the right way
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Apr 30, 2010 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Education Advisor

    Start by drawing a free-body diagram and identifying the forces on the rod.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook