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Homework Help: Relative Motion Question (PHYSICS 20)

  1. Oct 7, 2008 #1
    1. The problem statement, all variables and given/known data

    You swim from the west to the eastern shore across a 30m wide section of the bow river at 3.5m/s @ 30° N of E. If the river flows southward at 4.0m/s, determine your resultant velocity/

    2. Relevant equations

    - Trig (SOH CAH TOA)

    3. The attempt at a solution

    So first I drew the vector 3.5 m/s @ 30° N of E and found y ( 1.75 m/s [N] ) and the x
    ( 3.031 m/s [E] ). From the question, 4.0 m/s - 1.72 m/s [N] = 2.25 m/s . Therefore, the new triangle would have x= 3.031 m/s and y= 2.25 m/s with hyp = 3.77m/s with the angle of 36.6

    ANS = 3.8 m/s @ 37° S of E (??)
  2. jcsd
  3. Oct 8, 2008 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Welcome to PF.

    Your solution is correct :approve:
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