Homework Help: math

Posted by matematicass on Tuesday, June 5, 2012 at 5:19pm.

what angle between vectors u = 2j+2k & v= 3i+4k
Gracias por ayudarme

math - Steve, Tuesday, June 5, 2012 at 5:33pm
u.v = |u| * |v| * cosθ

cosθ = (6+8)/(2√2)(5) = 14/10√2
θ = 8.13°
math - Count Iblis, Tuesday, June 5, 2012 at 5:34pm
u dot v = |u| |v| cos(theta)

u dot v = 6

|u| = 2 sqrt(2)

|v| = 5

cos(theta) = 3/[5 sqrt(2)]
math - Count Iblis, Tuesday, June 5, 2012 at 5:36pm
Correction u dot v = 8, so

cos(theta) = 4/[5 sqrt(2)]
math - matematicas, Tuesday, June 5, 2012 at 6:47pm
but isn't is a three dimensional vectors
math - Steve, Wednesday, June 6, 2012 at 12:40pm
my bad. I misread the problem.
Count Iblis is correct.

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