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Does this make sense? Something hanging from an accelerating object

  1. Nov 24, 2008 #1
    1. The problem statement, all variables and given/known data
    A pair of fuzzy dice is hanging by a string from your rearview mirror. While you are accelerating from a stoplight to 28m/s in 6s, what angle does the string make with the vertical?


    2. Relevant equations
    g, accel. of car is 4 2/3 m/s^2


    3. The attempt at a solution
    [​IMG]

    I just figured the two accelerations were all that was necessary since the string length and mass are not given. So the angle is arctan(4.66/9.8) or 25.43 degrees? I did this in class in under a minute and it seems right but on the other hand it also seems too easy.
     
  2. jcsd
  3. Nov 24, 2008 #2

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

    Yes it is that easy (assuming your arithmatic is correct)
     
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