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 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: 2,103 Thanks: 704 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: 6,511 Thanks: 585 Notice that a,b,a+b form an equilateral triangle.

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