Solved: What Does (i) Mean in 3.86 N(i)?

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Homework Statement


Okay, I am just trying to find out what (i) means in this guys work!

Check attachment!

its says somewhere 3.86 N(i) is that initial?
 

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Ah okay i think its just a variable to keep track where it came from
 
Nah, he saying i as in \hat{i}[/tex] (there should be a hat on the i...), i.e. the vector component in the i unit vector direction (sometimes also x). It's typical for people to write unit vectors as x->i y->j and z->k.
 

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