HELP easy algebra vector question please

  • Thread starter Thread starter vorcil
  • Start date Start date
  • Tags Tags
    Algebra Vector
AI Thread Summary
To find the dot product of two perpendicular vectors a and b, it's essential to note that the dot product equals zero since the cosine of a right angle is zero. The discussion highlights confusion regarding the magnitude of vector a, which is stated as both 3 and the square root of 3, leading to a lack of clarity in the problem. Participants emphasize the importance of not posting the same question in multiple forums to avoid confusion. The key takeaway is that the dot product can confirm the perpendicularity of vectors. Understanding these concepts is crucial for solving the algebra vector question effectively.
vorcil
Messages
395
Reaction score
0
1. Find a.b given the following information
|a|=3

two vectors a.b are perpendicular to each other

b
|
|
|
|__________a


3. |a| = 3
a = squareroot of 3,

if B is a vector perpendicular to a,
dunno what to do from here,

quick response please
 
Last edited:
Physics news on Phys.org
You want the dot product of two vectors that are perpendicular to each other?

What is the cosine of a right angle?

Does that give you any ideas?
 
This doesn't make any sense. First you say the magnitude of the vector is 3, then you say it equals the square root of three?

Also, I see no question. (Might be the dot product as Dr.D suggests but I don't see it)
 
Please don't post the same problem in two different forums. You also posted this in the Calculus and Beyond forum.
 
One important application of "dot product" is determining if two vectors are perpendicular. Do you remember how?
 

Thread 'Family of lines that are at a distance of 5 from the origin'

I picked up this problem from the Schaum's series book titled "College Mathematics" by Ayres/Schmidt. It is a solved problem in the book. But what surprised me was that the solution to this problem was given in one line without any explanation. I could, therefore, not understand how the given one-line solution was reached. The one-line solution in the book says: The equation is ##x \cos{\omega} +y \sin{\omega} - 5 = 0##, ##\omega## being the parameter. From my side, the only thing I could...
View full post »

Thread 'Making the denominator of a certain fraction real'

Essentially I just have this problem that I'm stuck on, on a sheet about complex numbers: Show that, for ##|r|<1,## $$1+r\cos(x)+r^2\cos(2x)+r^3\cos(3x)...=\frac{1-r\cos(x)}{1-2r\cos(x)+r^2}$$ My first thought was to express it as a geometric series, where the real part of the sum of the series would be the series you see above: $$1+re^{ix}+r^2e^{2ix}+r^3e^{3ix}...$$ The sum of this series is just: $$\frac{(re^{ix})^n-1}{re^{ix} - 1}$$ I'm having some trouble trying to figure out what to...
View full post »

Similar threads

Given value of vectors a,b, b.c and a+(b×c), Find (c.a)
Replies
5
Views
2K
To find the component of a vector perpendicular to another
Replies
20
Views
3K
Value of an unusual vector notation
Replies
14
Views
3K
A,B,C are 3 points with position vectors a,b,c Find length of median
Replies
18
Views
2K
Solving system of 3 quadratic equations
Replies
4
Views
2K
Find Vector b Given a: |a|=3, Perpendicular to a
Replies
3
Views
1K
Solving Vector Spaces Tasks: Basis and Linear Transformations
Replies
7
Views
2K
Find the angles of the triangle
Replies
17
Views
3K
Vector Cross Product Homework: Expand $\vec{v}\times({\nabla}{\times}\vec{A})$
Replies
2
Views
2K
Prove the identity matrix is unique
2
Replies
69
Views
8K

Hot Threads

Recent Insights

Back
Top