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Vector addition and subtraction

by steve7
Tags: addition, subtraction, vector
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steve7
#1
Feb8-11, 09:35 PM
P: 2
1. Vector A has a magnitude of 14 m and makes an angle of 26o with the positive x axis. Vector B also has a magnitude of 13 m and is directed along the negative x axis. Enter your answers in distance then angle(in degrees).



2. Find A + B
Find A - B




3. 14cos(26)=12.6 x component for A
14sin(26)=6.14 y component for A

-13 x component for B
0 y component for B

A+B
sqrt( (Ax+Bx)^2 + (Ay+By)^2 )

sqrt( (12.6-13)^2 + (6.14)^2 )

A+B=6.16

tan-1(y/x)
tan-1(6.14/-.4)=-86.3*

I haven't attempted A-B yet.
Tell me where I'm going wrong. Any help is appreciated.
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Asphyxiated
#2
Feb8-11, 09:45 PM
P: 264
in the arctan equation .4 should be -.4, also why are you using 6.15 when the only vertical component is 6.14?
steve7
#3
Feb8-11, 09:51 PM
P: 2
Quote Quote by Asphyxiated View Post
in the arctan equation .4 should be -.4, also why are you using 6.15 when the only vertical component is 6.14?
it was a typo. I corrected them.

thanks


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