Thursday

August 21, 2014

August 21, 2014

Posted by **Ted** on Tuesday, February 5, 2013 at 4:11pm.

Calculate the magnitude of vector AB

Determine the coordinates of point D on vector CD, if C (-6,0) and vector CD= vector AB.

Please I need some help. Is there a formula to solve this? Pls help

- Calculus and vectors -
**Reiny**, Tuesday, February 5, 2013 at 4:21pmI will let A be (-4,2) and B(-1,3)

vector AB = ( -1+4 , 3-2)

= (3,1)

magnitude of AB = √(3^2 + 1^2) = √10

let D be (x,y)

the vector CD = (x+6, x-0) = (x+6 , y)

but if vector AB = vector CD

then x+6 = 3

x = -3

and y = 1

so point D is (-3,1)

in general if A is the point (a,b) and B is the point (c,d)

then vector AB = ( c-a , d-b)

and vector BA = ( a - c, b - d)

note that vector AB = - vector BA

**Related Questions**

Calculus and vectors - Vector AB is a vector whose tail is at (-4,2) and whose ...

Calculus and vectors - Please help/verify the answer. 1. When you add vectors ...

phys - 1. A vector has (at minimum) how many parts associated with it? 2. When ...

physics - 1. A vector has (at minimum) how many parts associated with it? 2. ...

Math - Algebraic Vectors - 1) The vector v = [-6, -2] has tail "A" and head "B...

precalc - If is vector a ia 7 units long, the magnitude of vector b is 10 units ...

Precalc - Suppose vector a is 3 units long, the magnitude of vector b is 1 units...

Math - 2004 (2nd) course2-3.2 Let P and Q be points on the line y=x+4 where the ...

Physics - The three vectors have magnitude a =3m, b= 4m and c=10m . On the x ...

Calculus - 1. Find an ordered pair that represents 6 vector v - 5 vector w if ...