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September 19, 2014

September 19, 2014

Posted by **Alex** on Tuesday, March 25, 2008 at 10:01pm.

Find the projection of u onto v and calculate its magnitude.

a) u = (2,5) v = (6,4)

b) u = (3, 6, -2) v = (-4, 3, 8)

2) If u and v are non zero vectors, but Projection (u unto v) = 0, what conclusion can be drawn?

Would that also mean Projection (v unto u) = 0?

3) Find the projection of PQ onto each of the coordinate axes, where point (2,3,5) and Q is the point (-1,2,5).

- Vectors -
**bobpursley**, Tuesday, March 25, 2008 at 11:35pmIt is said simply here

http://www.math.oregonstate.edu/home/programs/undergrad/CalculusQuestStudyGuides/vcalc/dotprod/dotprod.html

If the projection is zero, the dot product is zero, and thelines are perpendicular.

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