Question

find b if v=<1/5,b> is a unit vector

Answer 1

find \[\|v\|\]

Answer 2

What is v?

Answer 3

v isn't given. that is all the question states

Answer 4

how do i find IIvII if i don't know b?

Answer 5

the same way you would do it if you did know b

Answer 6

I agree ^-^ because it is asking the sam thing kinda

Answer 7

\[\|<\alpha,\beta>\|=\sqrt{\alpha^2+\beta^2}\]

Answer 8

ok and set that equal to zero and solve for b?

Answer 9

no...set equal to 1...it is supposed to be a unit vector

Answer 10

solve

\[\|<1/5,b>\|=\sqrt{(1/5)^2+b^2}=1\]

for b

Answer 11

so would it be 4/5?

Answer 12

no

Answer 13

1/5 squared is 1/25

Answer 14

square root of that is 1/5

Answer 15

subratct that from 1

Answer 16

\[\sqrt{(1/5)^2+b^2}=1\]

\[(1/5)^2+b^2=1\]

\[b^2=1-(1/5)^2=1-1/25=24/25\]

\[b=\pm\sqrt{24/25}\]

Answer 17

zarkon when you are done here can you see if you know this
http://openstudy.com/groups/mathematics#/groups/mathematics/updates/4e6832ed0b8b4a2b95c7826f

Answer 18

because i don't

Answer 19

my math lab says that b is wrong?

Answer 20

so what does math lab say?

Answer 21

sorry it was right, i just typed it in wrong