subject
Mathematics, 13.07.2019 12:10 kayla2945

Find the values of x and y in the diagram


Find the values of x and y in the diagram

ansver
Answers: 1
ansver
Answer from: Quest

the value of v.w= -12.

step-by-step explanation:

we are given three vector r,v and w as:

r = < 5, -5, -2> ; v = < 2, -8, -8> ; w = < -2, 6, -5>

we know that r,v and w could also be represented as:

r=5i-5j-2k

v=2i-8j-8k

and w= -2i+6j-5k

where i,j and k are the unit vectors of x,y and z-axis respectively.

also we know that it has the following property:

i.i=1 ; j.j=1; k.k=1

and i.=j.i=i.k=k.i=j.k=k.j=0

i.e. when we multiply two vectors or we find it's dot product we need to only multiply the components of x coordinates with each other; y with each other and z with each other.

hence, v.w= (2i-8j- -2i+6j-5k)

                  = 2×(-2)+(-8)×(6)+(-8)×(-5)

                  = -4-48+40

                  = -12

hence, v.w= -12

Another question on Mathematics

question
Mathematics, 21.06.2019 18:10
If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.
Answers: 1
question
Mathematics, 21.06.2019 18:20
What value of x is in the solution set of 4x - 12 s 16 + 8x? -10 -9 -8 -7
Answers: 1
question
Mathematics, 21.06.2019 18:40
Aportion of a hiking trail slopes downward at about an 84° angle. to the nearest tenth of a flot, what is the value of x, the distance the hiker traveled along the path, if he has traveled a horizontal distance of 120 feet? a. 143.3 b. 12.5 c. 120.7 d. 130.2
Answers: 1
question
Mathematics, 21.06.2019 22:20
Question 5 of 10 2 points if a population is a sample of the population could be a. registered voters; all citizens o o b. baptists; all religious people o c. people who purchased shoes; all customers o d. the entire school faculty; math teachers
Answers: 3
You know the right answer?
Find the values of x and y in the diagram
...
Questions
question
Mathematics, 26.07.2021 09:10
question
Mathematics, 26.07.2021 09:20
question
Law, 26.07.2021 09:20
question
Biology, 26.07.2021 09:20
question
Mathematics, 26.07.2021 09:20
Questions on the website: 13722365