• Support PF! Buy your school textbooks, materials and every day products Here!

Confused on vectors.

  • Thread starter AryRezvani
  • Start date
  • #1
67
0

Homework Statement



11l1rag.jpg


Homework Equations



x^2 + y^2 = r^2

The Attempt at a Solution



I understand everything, but the last segment.

What vector B when added to vector A, gives a resultant vector with no x component and a negative y component 3.34 units in length?

So 3.34 = Sqr Root [(0^2) + (y^2)]

You get 3.34 again, and because it states the y component should be negative, I plugged in -3.34, but alas, it's wrong. -.-

Ignore the 2.12 that I plugged in on the screenshot, I was just trying different ways of working this out.
 

Answers and Replies

  • #2
Doc Al
Mentor
44,874
1,124
They want the j component of A + B to equal -3.34. Do your values for the j components add to -3.34? (Set up a simple equation and solve for By.)
 
  • #3
67
0
They want the j component of A + B to equal -3.34. Do your values for the j components add to -3.34? (Set up a simple equation and solve for By.)
Thanks.
 

Related Threads for: Confused on vectors.

Replies
5
Views
507
Replies
22
Views
7K
Replies
0
Views
1K
  • Last Post
Replies
7
Views
1K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
3
Views
944
  • Last Post
Replies
4
Views
620
  • Last Post
Replies
3
Views
1K
Top