# Vectors -- Adding velocity vectors to make a resultant

## Homework Statement

Determine the vectors A-C, given the vectors A and C in Fig. 3-32. Vector A=44.0 at 28 degrees north of east and vector C=31.0 at 90 degrees south of east.

## Homework Equations

I don't know any.

## The Attempt at a Solution

44.0-31.0=11.0, 28.0-90= -62
The answers are 64.6 and 53.1 degrees.

## Answers and Replies

BiGyElLoWhAt
Gold Member
Hmmm... you took 2 vector lengths, and subtracted them. That works if they're parallel, but not at different angles.

Write your vectors in a couple different forms and post back. (I'm sure you've seen different ways to express the same vectors)

NascentOxygen
Staff Emeritus
Science Advisor

## Homework Statement

Determine the vectors A-C, given the vectors A and C in Fig. 3-32. Vector A=44.0 at 28 degrees north of east and vector C=31.0 at 90 degrees south of east.

## Homework Equations

I don't know any.

## The Attempt at a Solution

44.0-31.0=11.0, 28.0-90= -62
The answers are 64.6 and 53.1 degrees.
We don't see Fig. 3-32, but I assume you do.

First step, sketch the vectors in their given orientation so you can see what you are dealing with.

Second step, remember the rule that says to subtract a vector you can reverse its direction and add it.

BTW, you might need to brush up on your arithmetic, too. NascentOxygen
Staff Emeritus
Science Advisor
It's unusual and longwinded to describe a direction as 90 degrees South of East. Are you sure you have that specification correct?