VECTORS HELP !!!

A

Ana.stasia

Junior Member
Joined
Sep 28, 2020
Messages
118
QUESTION:
Determine the projection of the vector AB on the s-axis, if the angle between the vector AB and the unit vector e of the s-axis = 60 degrees and if the intensity AB is 8.

This is how I TRIED to do it.

130712467_1060495367751975_4950729069695335237_n.jpg

I got 4, which is correct. However I am not sure If what I got is even the projection of vector AB. And if it is, why?

Thank you in advance.
 
Ana.stasia said:
QUESTION:
Determine the projection of the vector AB on the s-axis, if the angle between the vector AB and the unit vector e of the s-axis = 60 degrees and if the intensity AB is 8.

This is how I TRIED to do it.

View attachment 23635

I got 4, which is correct. However I am not sure If what I got is even the projection of vector AB. And if it is, why?

Thank you in advance.
Click to expand...
Your answer is correct.

However, for "why" - do a google search with key-words "dot product, projection, vector".

If you do not understand something please come-back and tell us with a reference.
 
Ana.stasia said:
QUESTION:
Determine the projection of the vector AB on the s-axis, if the angle between the vector AB and the unit vector e of the s-axis = 60 degrees and if the intensity AB is 8.

This is how I TRIED to do it.

View attachment 23635

I got 4, which is correct. However I am not sure If what I got is even the projection of vector AB. And if it is, why?

Thank you in advance.
Click to expand...
What were you taught as the definition of the (scalar) projection of a vector on a line?

Why are you not sure that the scalar product with a unit vector is the scalar projection on that line?
 
Dr.Peterson said:
What were you taught as the definition of the (scalar) projection of a vector on a line?

Why are you not sure that the scalar product with a unit vector is the scalar projection on that line?
Click to expand...

We were not taught anything. We just have homework and I am trying to learn it by myself.
 
You must log in or register to reply here.
Top