Posted by **Nat** on Sunday, April 5, 2009 at 4:54am.

the components of a vector V can be written (Vx,Vy,Vz). what are the components and length of a vector which is te sum of the 2 vectors, V1 and V2, whose components are (8,-3.7,0) and (3.9,-8.1,-4.4)?

- physics--vectors -
**drwls**, Sunday, April 5, 2009 at 6:53am
Add the corresponding components to get the components of the sum vector.

The length is the square root of the sum of the squared components

- physics--vectors -
**Nat**, Sunday, April 5, 2009 at 9:07am
how do i find the angle between the summed vector and the z axis in this reference frame?

- physics--vectors -
**drwls**, Sunday, April 5, 2009 at 10:53am
The cosine of that angle is vertical component divided by the vector length.

They don't ask for that angle in your original question

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