# Vectors x, y,z rather confusing question.

Hi there!

I'm puzzled halfway between these two vector questions.

Could anyone clear it up for me?

I've done half of it, but not sure what to do next...

http://img135.imageshack.us/img135/6442/screenshot20101123at034.png [Broken]

This is what I've done so far:

http://img194.imageshack.us/img194/2171/imag0003cf.th.jpg [Broken]

I'm thinking.... the final answer might be 2 root 6?
Because:

Magnitude^2= Fx^2 +Fy^2 + Fz^2

Rearranged for: Magnitude^2 - Fx^2 - Fy^2 = Fz^2

So: 4^2 - 2^2 - (2sqrt2)^2

I got final answer as 2sqrt6

Would that be right for finding z? If so, how would I find the angle?

Question 4 I'm completely stumped on... It's asking me to calculate the speed, but all I have is the angle... =S

Anyone got any ideas?

Last edited by a moderator:

Mark44
Mentor
Please resize your image to no larger than 650 x 490 and repost. The image you posted is 1552 x 2592, and is so large you can't see all of it unless you scroll sideways and down.