# Homework Help: Bearing Problem

1. Jun 6, 2007

### Lavace

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 :|.

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. Jun 6, 2007

### skeeter

you want alpha + 180.

3. Jun 7, 2007

### esalihm

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