Hi, I'm stuck here:(adsbygoogle = window.adsbygoogle || []).push({});

P1(1,2,3) and P2(2,2,2)

Q1: Find a unitvector that points from P1 to P2. - A unitvector is a vector with length 1, right? But then what...?

Q2: A point M lies on the center on the line from P1 to P2. What is the position vector to M?

The sides of a parallellogram are a=2i-j+k and b=i+j

Q3: Find two vector that make up the diagonals. - I don't have a clue, which sides are a and b? And WHY! does my crappy book insist on writing everything with "i, i and k" thus making everything more difficult to read. (In HS we had fx: AB=[2,5,1]...)

Thanks for hints!

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Simple vector problems (hints please)

**Physics Forums | Science Articles, Homework Help, Discussion**