Question

can sombody help me this question D in this... http://imageshack.us/photo/my-images/716/picture4ai.png/ much appreciated

Answer 1

wrong section. Post it in math section bro and not physics :)

Answer 2

i did but math is clogged right now nobodies looking at it. and actually vectors are a part of physics too! kinematics... haha if you know how to answer it give it a try. not going to hurt you being in the 'wrong' section

Answer 3

LOLOL.. This is pure 3D geometry question. Tell me where exactly you are facing problem. I am not going to give the entire solution

Answer 4

well i mean they are VELOCITY vectors ;) but its all math haha. and just question D, all of it haha. ill type in the answers to a, b and c. you need them i think.

Answer 5

How can I know what you require and what you don't?

So as far as I understood, you are facing in part d only.Is that correct ??

Answer 6

You are facing "problem " in part d only ..

Answer 7

a) r = (8, 1, 0) + t (0, 0, 1)

b) you dont need this for question D, but just setting the respective x, y, and z, coordinates lets s=2 which proves it.

c) i) showing it isnt useful for D
ii) AB = (2, -1, 5)

yes, i only need help with part d

Answer 8

I am getting Point D(0,2,-9). Is it correct ??

Answer 9

@TCP2315

Answer 10

close, but no, the answer i have from the mark scheme is (4, -2, 9) :S

Answer 11

@TCP2315 , make sure these are the right coordinates
A (6,2,9)
B(8,1,14)
C(2,1,-4)
Reply if they are correct/wrong??

Answer 12

i have those as well, yes.

Answer 13

@TCP2315 , I have cross verified my answer and it is coming as (0,2,-9). See the solution below.

Let D(x,y,z)

Since Line BC is parallel to line AD, therefore, the direction ratios of both lines are proportional. Let the following equation be equation 1


Since Line DC is parallel to line AB, therefore, the direction ratios of both lines are proportional Let the following equation be equation 2


x-value, y-value and z-value from both equation 1 and equation 2
Equating both x values , y values and z-values we get