June 22nd, 2015, 03:35 AM  #1 
Newbie Joined: Jun 2015 From: India Posts: 2 Thanks: 0  A question on Unit Vectors, please help
Let a and b be two unit vectors and p is the angle between them. Then a+b is a unit vector of: 1. p = pi/3 2. p = pi/4 3. p = pi/2 4. p = 2pi/3 
June 22nd, 2015, 05:02 AM  #2 
Senior Member Joined: Apr 2014 From: Glasgow Posts: 2,037 Thanks: 674 Math Focus: Physics, mathematical modelling, numerical and computational solutions 
Have you tried answering it yet? Have you drawn a diagram with some unit vectors on it?

June 22nd, 2015, 12:54 PM  #3 
Global Moderator Joined: May 2007 Posts: 6,275 Thanks: 516 
Notice that a,b,a+b form an equilateral triangle.


Tags 
question, unit, vectors 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
The Perpendicular Unit Vectors i and j  bilano99  Calculus  2  February 8th, 2012 01:49 PM 
Unit Interval vs. Unit Square Cardinality Question  miss_direction  Real Analysis  2  May 13th, 2011 08:36 PM 
2 unit vectors dot product  onako  Linear Algebra  2  September 23rd, 2010 08:48 AM 
Test(s) for random unit vectors  idolorand  Algebra  0  January 14th, 2010 01:14 PM 
orthogonal unit vectors  hrc  Linear Algebra  6  March 3rd, 2008 01:59 PM 