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Homework Help: Circular motion and vectors

  1. Nov 3, 2008 #1
    1. The problem statement, all variables and given/known data
    A block is hung by a string from ther inside roof of a van. When the van goes straight ahead, at a speed of 28 m/s, the block hangs vertically down. But when the van rounds a curve, the block swings toward the outside of the curve, making an angle with its previous position. Determine the angle at which this block hangs.

    2. Relevant equations
    Fx=ms, FTx=ma, Fy=may, Fty=mg

    3. The attempt at a solution

    okay, so i know that i use FW=mg and a=v2/r to find the two numbers that i will eventually use to find the inverse tangent of the angle... but how do i get the mass for FW=mg, how would i find the mass so i can finish this problem.
  2. jcsd
  3. Nov 3, 2008 #2


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    Homework Helper

    Maybe approach it a little more simply and treat the accelerations acting on the block as a vector addition problem?
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