Results 1 to 4 of 4

Math Help - Rotation problem

  1. #1
    Newbie
    Joined
    Sep 2008
    From
    Oregon
    Posts
    6

    Rotation problem

    If you had a 3" shaft welded to a 9" dia wheel. what is the rpm's if the 3" shaft is at 15rpm?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Forum Admin topsquark's Avatar
    Joined
    Jan 2006
    From
    Wellsville, NY
    Posts
    9,817
    Thanks
    316
    Awards
    1
    Quote Originally Posted by windseaker View Post
    If you had a 3" shaft welded to a 9" dia wheel. what is the rpm's if the 3" shaft is at 15rpm?
    I presume that the shaft is welded perpendicular to the plane of the wheel and at the center of it. So since the 3" shaft is rotating at 15 rpm, the so must the wheel as there is no slipping between the shaft and the wheel. (ie. a point on the shaft has to have the same angular speed as a point on the wheel does.

    -Dan
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Sep 2008
    From
    Oregon
    Posts
    6

    Red face rotaion problem

    I'm sorry, I was asking an incomplete question!

    What is the rpm of the 9" wheel?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Junior Member
    Joined
    Sep 2008
    Posts
    28
    If the shaft is perpendicular to the wheel (like an axle), then the 9" wheel will also be rotating at 15 rpm. If you were to mark a point on the shaft, then mark the same point on the wheel, they would stay in the same relative positions to each other. The speed of the point on the wheel would be going faster than the point on the shaft, but the point on the wheel also has to travel farther, making the time for one rotation equal for both. Make sense?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 0
    Last Post: January 14th 2012, 08:02 PM
  2. Co-ordinate Reflection/Rotation Problem
    Posted in the Geometry Forum
    Replies: 2
    Last Post: November 28th 2011, 01:27 AM
  3. [SOLVED] Interesting rotation problem
    Posted in the Geometry Forum
    Replies: 6
    Last Post: August 10th 2010, 08:26 AM
  4. Rotation Matrix problem
    Posted in the Advanced Algebra Forum
    Replies: 6
    Last Post: May 4th 2010, 06:06 PM
  5. Quaternion to rotation matrix problem...
    Posted in the Geometry Forum
    Replies: 0
    Last Post: April 28th 2010, 11:22 PM

Search Tags


/mathhelpforum @mathhelpforum