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: Angular physics problem

  1. Mar 27, 2005 #1
    An astronaut is being tested in a centrifuge. The centrifuge has a radius of 8.5 m and in starting, rotates according to theta= .21t^2, where t in seconds give theta in radians. When t=5.0 s, what are the astronaut's angular velocity?

    I did .21(5.0)^2 / 5, to get angular velocity, but it was wrong. Can someone steer me in the right direction?
     
  2. jcsd
  3. Mar 27, 2005 #2
    I have no idea what equation that is that your using.

    [tex] \theta(t) = .21t^2 [/tex]

    [tex] \omega(t) = .42t [/tex]

    by the relationship [tex] \omega(t) = d\theta(t)/dt [/tex]
     
    Last edited: Mar 27, 2005
  4. Mar 27, 2005 #3

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    Why do they give the radius,if they don't ask for the tangential speed...?:bugeye:

    Daniel.
     
  5. Mar 27, 2005 #4
    Probably needs help on just one part of the problem.
     
  6. Mar 27, 2005 #5
    Ok I see what I was doing. Thanks so much
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook