Help please

[Guest]

Given the vectors v=-2i + 5j and w=3i + 4j, determine

3.)length of w 4.) the unit vector for v

 

[stapel]

To find the length, take the modulus. To find the unit vector, divide the given vector by the modulus. How far have you gotten in applying the formulas?

Eliz.

u = ai + bj

length |u| = sqrt[a² + b²]

unit vector: u/|u|

http://www.physics.uoguelph.ca/tutorials/vectors/vectors.html
http://mathforum.org/~klotz/Vectors/vectors.html

 

[Guest]

I dont know what a modulus is

 

[stapel]

If you don't know the basic terminology, then follow the links (provided earlier) to lessons on the topic.

Eliz.