Vectors x, y,z rather confusing question.

[KazuyaXR]

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

This is what I've done so far:

http://img194.imageshack.us/img194/2171/imag0003cf.th.jpg

Uploaded with ImageShack.us

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?

 

[Mark44]

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.