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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]

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?

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]

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?

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