Homework Help: Vectors Help me pls!

Posted by Segun on Monday, April 16, 2007 at 10:28am.

Dtermine the value of a so that
u=2i+aj+k and 4i-2j-2k are perpendicular

Did you just start this topic?
This is a very easy question.

if two vectors are perpendicular, then their dot product must be zero

then (2,a,1).(4,-2,-2)=0

8-2a-2=0
a=3

No one has answered this question yet.

Answer this Question

Related Questions

IB Math SL - Find a unit vector which is perpendicular to both of the vectors 4i...
physics - Find a vector of magnitude 18 which is perpendicular to both the ...
algebra - Find the angles between the following pairs of vectors (1)3i+2j-6k,4i-...
algebra - Find the angles between the following pairs of vectors (1)3i+2j-6k,4i-...
physics - A=2i+3j-k, b=4i=2j-2k, find the vector x parallel to A but has ...
physics - Given three vectors a~=Ài~À4j~+2k~ , b~=3i~+2j~À...
math - two vectors are defined as a=2i+xj and b=i-4j. find value of x if a) the ...
math - two vectors are defined as a=2i+xj and b=i-4j. find value of x if a) the ...
Algebra - I have to rationalize the denominator of 2+3i/1+2i. I multiplyed this ...
Algebra2 - Simplify: 1.SquareRoot(-144) 2.SquareRoot(-64x^4) 3.SquareRoot(-13)*...

For Further Reading

First Name:
School Subject:
Answer: