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Uniformly accelerated train problem

  1. May 2, 2010 #1
    After picking up passengers, a train accelerates uniformly until its speed is 100 km/hr at t= 300 s. If during this time it is traveling on a planar path that approximates the circle and line shown in the figure, find the magnitude of the train's acceleration when (a) t = 1 min and (b) t = 2 min.

    link to figure:
    http://i22.photobucket.com/albums/b346/lopezjose/IMG00264-20100502-0017.jpg

    I'm not sure what frame of reference to use and how to start this problem

    normal acceleration is v^2/r
    tangental acceleration is dv/dt
     
  2. jcsd
  3. May 2, 2010 #2

    tiny-tim

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    Welcome to PF!

    Hi jlopez! Welcome to PF! :smile:

    (try using the X2 tag just above the Reply box :wink:)

    First, use one of the standard constant acceleration equations to find the linear (tangential) acceleration.

    Then find the position at 1 min and 2 min, and if the path is curved then, find the speed and the centripetal acceleration (the normal acceleration). :smile:
     
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