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: 2,068 Thanks: 692 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: 6,343 Thanks: 534 
Notice that a,b,a+b form an equilateral triangle.


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