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!

(UCM) Maximum Rev. Per Minute Using Length and Acceleration

  1. Feb 21, 2012 #1
    1. The problem statement, all variables and given/known data

    An astronaut rotates at the end of a test machine whose arm has a length of 10m. If the acceleration she experiences must not exceed 5g (g = 10 ms^-2), what is the maximum number of revolutions per minute of the arm?


    2. Relevant equations

    T = (2πR)/v

    V = (2πR)/T

    Ac = V2/r


    3. The attempt at a solution

    Ac = v2/r

    Plug in acceleration given and radius (from length of 10m): 10 = v2/5

    5*10 = 50

    50 = v2

    v = 7.07107

    T = 2π*5/7.07107

    T = 4.44288 revolutions for 1g

    Multiply 4.44288 by 5 = 22.2144 RPM?
     
    Last edited: Feb 21, 2012
  2. jcsd
  3. Feb 21, 2012 #2

    ehild

    User Avatar
    Homework Helper
    Gold Member

    Hi Oziemaster,

    Do you know what "g" is?

    ehild
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: (UCM) Maximum Rev. Per Minute Using Length and Acceleration
  1. Revolutions per minute (Replies: 1)

Loading...