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Homework Help: Circular motion of a train magnitude and angle

  1. Nov 2, 2008 #1
    1. The problem statement, all variables and given/known data
    A train is rounding a circular curve whose radius is 2.00 X 10[tex]_{}2[/tex] m. At one instant, the train has an angular acceleration of 1.50 X 10^-3 rad/s[tex]_{}2[/tex] and an angular speed of 0.0400 rad/s.
    (a) Find the magnitude of the total acceleration (centripetal plus tangential) of the train.

    (b) Determine the angle of the total acceleration relative to the radial direction.

    2. Relevant equations
    a[tex]_{}NET[/tex] = [tex]\sqrt{}ac2^{}_{} + at2^{}[/tex]
    and Ac is the centripetal acceleration, At is the tangential acceleration

    3. The attempt at a solution
    i tried using this equation, but i couldn't find At. to find this, you need delta velocity divided by delta time, but there is no time and i don't know if angular speed is the same thing as regular velocity
  2. jcsd
  3. Nov 2, 2008 #2
    You can find At by using the formula: angular acceleration = tangential acceleration / radius.

    I'm not sure how to find the angle though...
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