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Homework Help: Bearing Problem

  1. Jun 6, 2007 #1
    1. The problem statement, all variables and given/known data
    A boat is moving with constact velocity -1 + 6j.
    Find the direction in which the boat is moving, giving your answer as a bearing.

    3. The attempt at a solution

    http://img483.imageshack.us/img483/2457/bearintgsxk3.jpg [Broken]
    Alpha is the bearing I want right?
    In the mark scheme it says 351, its this because they take the bearing in an Anti Clockwise motion. The angle next to Alpha is 9 degrees by the way (rounded).

    However, I always thought you ALWAYS take bearings in a clockwise motion?

    Can someone please clear up my confusion?

    Bearing seems to be my main weak point in Mechanics, and the test is tommorow :|.
    Thanks in advance!

    P.S: If you're doing the velocity of A relative to B. You minus B from A?
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Jun 6, 2007 #2
    you want alpha + 180.
  4. Jun 7, 2007 #3
    bearing are taken to be CCW
    that is why u need alpha only not 180+alpha
    also if u want an exact answer try using arctan

    and velocity of A relative to B is A-B (yes u minus B from A) but use vector subtraction!!!
    Last edited: Jun 7, 2007
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