Dot Product & Cross Product - Electronic Circuits Projects Diagrams Free

shermaine · 10th April 2004, 02:42 PM

Hello,

May i know what cases to use dot product and cross product?
Pls advise.
Thanks.

**Nigel Goodwin** · 10th April 2004, 03:18 PM

Quote:

Originally Posted by shermaine

Hello,

May i know what cases to use dot product and cross product?
Pls advise.
Thanks.

If you google for +"dot product" +"cross product" you get plenty of hits, is there any electronic reason for the question?. Probably if you don't know which to use, you don't need them!.

daviddoria · 10th April 2004, 10:59 PM

cross product yields a vector quantity that is orthogonal to both vectors that you crossed

dot product yields a scalar quantity. a simple appliaction is work = F (dot) d
F(dot)d = mag(F) mag(d) cos THETA

so if you use that for work, you automatically get the component of the force that is doing the work (in the same direction)

good luck

david

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10th April 2004, 02:42 PM	(permalink)
shermaine	Dot Product & Cross Product Hello, May i know what cases to use dot product and cross product? Pls advise. Thanks.

10th April 2004, 10:59 PM	(permalink)
daviddoria	cross product yields a vector quantity that is orthogonal to both vectors that you crossed dot product yields a scalar quantity. a simple appliaction is work = F (dot) d F(dot)d = mag(F) mag(d) cos THETA so if you use that for work, you automatically get the component of the force that is doing the work (in the same direction) good luck david __________________ thanks, david