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!

What is the minimum mass of the barbell without tipping?

  1. Nov 21, 2016 #1
    1. The problem statement, all variables and given/known data
    Typical weight sets used for bodybuilding consist of disk-shaped weights with holes in the center that can slide onto 2.20 m long barbells. A barbell is supported by racks located a fifth of its length from each end, as shown in the figure. What is the minimum mass m of the barbell if a bodybuilder is to slide a weight with = 22.0 kg onto the end without the barbell tipping off the rack? Assume that the barbell is a uniform rod.

    2. Relevant equations

    sum of all torques = 0

    3. The attempt at a solution

    I tried to make the the intersection of the barbell and the left rack the pivot point. Then I found the torque of the weight, the center of mass of the bar, and then the 2nd rack, but I came out with the wrong answer. I think I'm on the right track on how to do it, but I'm not sure where I'm messing up. Explanation would be helpful... studying for an upcoming test. Thanks!
     
  2. jcsd
  3. Nov 21, 2016 #2

    BvU

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    1. Make sure the problem statement is complete. What about the mass of the bar ?
    2. show your calculation work in detail

    Good luck !
     
  4. Nov 21, 2016 #3
    I'll try to find the page I did this on, but the mass of the bar is what I'm trying to find.
     
  5. Nov 21, 2016 #4
    Never mind, I got the answer myself haha.
     
  6. Nov 21, 2016 #5

    gneill

    User Avatar

    Staff: Mentor

    Can you provide the mass of the bar so others can work the problem if they come across this thread?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: What is the minimum mass of the barbell without tipping?
Loading...