vector addition and subtraction


by steve7
Tags: addition, subtraction, vector
steve7
steve7 is offline
#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.
Phys.Org News Partner Science news on Phys.org
NASA's space station Robonaut finally getting legs
Free the seed: OSSI nurtures growing plants without patent barriers
Going nuts? Turkey looks to pistachios to heat new eco-city
Asphyxiated
Asphyxiated is offline
#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
steve7 is offline
#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


Register to reply

Related Discussions
I need help with vector addition and subtraction Introductory Physics Homework 2
Re: Relativistic vector addition/subtraction of velocities General Physics 11
Re: Relativistic vector addition/subtraction of velocities General Physics 1
Re: Relativistic vector addition/subtraction of velocities General Physics 4
Relativistic vector addition/subtraction of velocities General Physics 8