A few days ago
christe_pol

i have question about vectors so please answer it. i am waitting for your answers. please.?

i have 3 questions and please answer them seperatly and tell me step by step how to do it.

Question 1: Prove that the vector a+ vector2b + vector c , vector a + vector3b – vector2c , vector a + vectorb + vector4c are linearly dependent.

Question 2: Prove that if vector a= vector i + vector 3j – vector 2k and vector b= vector i – vector j – vector k, then vector a and vector b are perpendicular.

Question 3: Find: (a) the magnitude of vector RS where R: (-1, 2, 0) and S: (5, 5, 6); (b) a unit vector in the direction of vector RS.

Question nr. 4 is also but if you want to answer it too so here it is: Find the magnitude of the vector xi + vector yj + vector zk.

Sorry I didn’t have any kind of math program to write the questions more clear, so I wrote them in word I hope you understand it.

Top 1 Answers
A few days ago
molawby

Favorite Answer

1) put the vector coordinates in a matrix and sovle it. If it does not reduce to the identity matrix the vectors are linear combinations by definition of linear dependence it is proven. 1 vector can be written as a linear combination of another

2)the dot product of 2 vectors is zero when the vectors are perpendicular

3) definition of distance is Magnitude,

also called the norm, ||v||.

use the distance formula in your text

||v||=sqrt[(5-(-1))^2 +(5-2)^2 + (6-0)^2)]

a unit vector has magnitude or 1

v=S-R

u(unit vector)= v/||v||

4) same as 3 find the norm

keep in mind (i,j,k) is the standard

normal vector. vector notation

gives us (x,y,z)

||v||=sqrt[(x)^2 + (y)^2 + (z)^2]

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