(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The diagram below shows two vectors, A and B, and their angles relative to the coordinate axes as indicated.

DATA: alpha = 42.7 degrees,

beta = 60.0 degrees,

A = 6.70 cm.

The vector A - B is parallel to the -x axis (points due West). Calculate the y component of vector B.

2. Relevant equations

SOH CAH TOA

3. The attempt at a solution

So I can't figure out what I am doing wrong. I thought I knew these basics!! ARG Anyway I got one chance left. So please let me know if i'm right

Well I found the angle of the triangle I am trying to find vecor y for. I am using the right triangle Since the sum vector (A-B) has no y-component, vector A must have the same y-component as vector B.

So:

90-42.7=47.3

cos47.3 = x/6.7

6.7 * cos47.3=x

Answer:

x=4.54367 cm

And thats it! BUT NOOOOO its not right ha. Is it suppose to be -4.54367cm because the component y is going y-? Or maybe I am just pig headed and am missing a major part in the problem.

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# Homework Help: Finding Vector Lengths: Can't figure out what I am doing wrong

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