1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Dot and cross product

  1. May 27, 2008 #1
    dot product and cross product. i (think dot product is like eg (1,2,4).(2,4,5) = 30 and cross product is like eg(1,2,4)x(2,4,5)=2, 8, 20) but im not sure... and is there an order like in a.bxc do u do bxc and then.a or do u go normal left to right. but if left to right whats the rule in when u multiply one number by a coordinante or vector...
    please help
     
  2. jcsd
  3. May 27, 2008 #2
    A dot product operation on two vectors results in a scalar i.e. a number [not a vector]. Whereas, the cross product always results in a vector. As for a.(b x c), you CANNOT open the bracket as: (a.b x a.c). This is because cross product is operation that is done on vectors and not on scalars, whereas both, a.b and a.c are scalars.

    So, you have to first find out the cross product of b & c, and then solve for the dot product of the resultant vector and a to get your answer.
     
  4. May 27, 2008 #3
    thanks for clearing that up :smile:
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Dot and cross product
  1. Dot product (Replies: 5)

  2. Cross product homework (Replies: 3)

  3. Dot and Cross Products (Replies: 3)

Loading...