Question

In unit vector notation what the magnitude of vector a+b?

vector a = 6.0 (i) - 4.0 (j)
vector b = 4.0 (i) + 8.0 (j)

I got 6 + 4 = 10 for i and 8 - 4 = 4 for j.

10^2 to 4^2 = 116. The sqrt of 116 is about 10.77 but my homework site keeps rejecting that answer. HELP!

Answer 1

Did you try entering something like \(\sqrt{116}\) or \(2\sqrt{29}\)

Answer 2

I put sqrt of 116.

Answer 3

10.77032961

Answer 4

are there any guidelines for approximation of answers?

Answer 5

+/- 2% within the exact answer

Answer 6

the odd thing is that I calculated the angle using the unit vectors and the system accepted my answer so I know my unit vector addition is correct.

Answer 7

Try using 10.8 then?

Answer 8

LOL it worked

Answer 9

that is so dumb

Answer 10

cool stuff

Answer 11

thanks for your suggestion