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Homework Help: Find Magnitude & Direction for acceleration:

  1. Jan 31, 2015 #1
    1. The problem statement, all variables and given/known data:
    Block B has acceleration of 4 m/s2... Relative acceleration of block A w/ respect to B is 4 m/s2. Find magnitude & direction of accel for A?

    2. Relevant equations

    a_A = a_B + a_A/B

    3. The attempt at a solution

    a_A = 4 +4 = 8 m/s2 <--

    8*cos(20) = 7.52 (x-component)

    8*sin(20) = 2.74 (y-component)

    direction= inverse tangent of (2.74 / 7.52) = 20.02 degrees <--

    this was my attempt, not sure if I did it correctly.

    Attached Files:

  2. jcsd
  3. Jan 31, 2015 #2


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    2017 Award

    Staff: Mentor

    Those are vectors, you cannot add their magnitudes.
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