Posted by Cindy on Thursday, December 15, 2011 at 12:29pm.
I totally don't understand Vectors
How do you describe a vector as an ordered pair?
on the x and Y where they cross it is 41 degrees and goes to the left up to the y 77
I am totally confused Help
geometry - Steve, Thursday, December 15, 2011 at 1:09pm
There are two common ways to describe a point in the plane.
Most familiar is the rectangular coordinates (x,y) which says how far left-right or up-down the point is from the origin (0,0).
Another way is to specify how far away a point is from the pole (0,0), and in which direction θ. The direction is usually expressed as 0-360° when first learning about polar coordinates.
So, you need to get familiar with the circle and how to handle degrees.
An (x,y) pair can be determined from an (r,θ) pair by referring to the right triangle with the vector to the point as hypotenuse.
x = r cosθ
y = r sinθ
to go the other way,
tanθ = y/x
r2 = x2 + y2
If all this looks unfamiliar, you need to check your textbook and have a one-on-one session with someone in person.
It sounds like your question is referring to a point where
θ = 41°
r = 77
To get the (x,y) coordinates,
x = 77 cos 41° = 58.1
y = 77 sin 41° = 50.5
Answer This Question
More Related Questions
- Mamthematics - Vectors - a) If vector u and vector v are non-collinear vectors ...
- 12th grade - prove that normal to plane containing 3 points whose position ...
- Vectors? - find an ordered pair to represent vector u in u = (3/4)w-2v if vector...
- Calculus - 1. Find an ordered pair that represents 6 vector v - 5 vector w if ...
- Vectors - Verify (Vector a + Vector b) × (Vector a + Vector b) = 0⃗ . What...
- PHYSICS VECTORS - 1. The problem statement, all variables and given/known data ...
- Physics - 2. We have two vectors that line in the x-y plane. If we take the ...
- math - The cruising speed of a Boeing 767 in still air is 530 mph. Suppose that ...
- Vectors - Use a specific example to prove that the cross product is also not ...
- Physics - This is another question I had too and didn't understand as well. ...