hello.i have this vector question for P1.
actually it was my mock exam question.
the question is:
the points A and B are such that the unit vector in the direction AB(from A to B) is 1/3i + pj +2/3k , where p is a negative constant.
i) find the value of p
then, the position vectors of A and B, relative to an origin O, are 9i +2j +qk and 12i -4j -5k respectively.
ii) find the value of q
thats all.thank you soo much.please reply asap..
I think u missed out something..
anyway da first part cn b done using nid404's method
ii>da ratio of i:k =1:2
AB~(12-9)i+(-4-2)j+(-5-q)k
3i-6j+(-5-q)k
Tere4 using 1:2
-5-q=6
q=-11Now its also possible 2 find
pAs da ratio is 3:6 =1:2
p=-2/3 (as p is a negative constant)