Mechanics, Year One, Forces and perpendicular vectors

[TalibanNinja]

Homework Statement

this website has the question listed as #2-116. the solution shown is extremely complicated and i ask thet someone please help.

http://www.scribd.com/doc/48470460/113/Problem-2-116

Homework Equations

The Attempt at a Solution

 

[HallsofIvy]

I am confused as to what you want. The pages you post have a detailed solution.

 

[TalibanNinja]

i don't understand what the "r" represents.

 

[azizlwl]

i don't understand what the "r" represents.

There are two "r", bold "r" and normal "r".

 

[TalibanNinja]

could you explain what bold r means, and what r means

 

[azizlwl]

could you explain what bold r means, and what r means

I think you should start from Chapter #1.