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Homework Help: Toy gyroscope physics problem

  1. Oct 28, 2007 #1
    1. The problem statement, all variables and given/known data

    The rotor (flywheel) of a toy gyroscope has mass 0.140 kilograms. Its moment of inertia about its axis is 1.20 x10^-4 kilogram meters squared. The mass of the frame is 0.0250 kilograms. The gyroscope is supported on a single pivot with its center of mass a horizontal distance 4.00 centimeters from the pivot. The gyroscope is precessing in a horizontal plane at the rate of one revolution in 2.20 seconds.

    (a) Find the upward force [tex]\vec{n}[/tex] exerted by the pivot.

    (b)Find the angular speed w at which the rotor is spinning about its axis, expressed in revolutions per minute.

    2. Relevant equations


    [tex]\tau[/tex]net = I*[tex]\alpha[/tex]

    F = ma

    3. The attempt at a solution

    I'm new to gyroscopes, so if anyone can point me in the right direction and help me step by step, that would be great!
  2. jcsd
  3. Oct 28, 2007 #2
    Bueler? ...Bueler? ....Bueler? ....Bueler?
  4. Oct 28, 2007 #3
    part (a) =

    (m_gyro + m_frame)g = 1.617N

    part(b)---working on it
  5. Oct 29, 2007 #4


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