# Math

posted by .

Two vectors 2a+b and a=3b are perpendicular. Find the angle between a and b, if |a| = 2|b|.

• Math -

Is a = 3b supposed to be a - 3b? or a + 3b?

If a = 3b is one of the vectors, then you would be saying that a and b are collinear, with |a| = 3|b|. That would contradict your later statement that |a| = 2|b|

## Similar Questions

1. ### Calculus

For which following condition, will the dot product of two vectors be zero?
2. ### math

two vectors are defined as a=2i+xj and b=i-4j. find value of x if a) the vectors are parallel b) the vectors are perpendicular
3. ### math

two vectors are defined as a=2i+xj and b=i-4j. find value of x if a) the vectors are parallel b) the vectors are perpendicular
4. ### physics

The problem concern the position vectors r1=2.43mi-4.74mj and r2=-3.02mi+0.85mj. Find the angle between the two vectors. Hint: Find the angle each makes with the +x-axis.
5. ### physics

The problem concern the position vectors r1=2.43mi-4.74mj and r2=-3.02mi+0.85mj. Find the angle between the two vectors. Hint: Find the angle each makes with the +x-axis.
6. ### physics

The problem concern the position vectors r1=2.43mi-4.74mj and r2=-3.02mi+0.85mj. Find the angle between the two vectors. Hint: Find the angle each makes with the +x-axis.
7. ### perpendicular vectors

Find two unit vectors each of which is perpendicular to vectors (1, 1, 0) and (1,0,1) What I did: a x b = (1, -1, -1) |axb|=square toot 3 correct answer is +/- (1/√3 - 1/√3 - 1/√3) or =+/- 1/√3 (1, -1, -1)
8. ### Math vectors

For which of the following conditions will the cross product of two vectors be zero?
9. ### Math

if vectors a+2b and 5a-4b are perpendicular to each other and a and b are unit vectors. Find the angle between a and b.
10. ### Math

Let a, b, and c be unit vectors, such that a+b+c=0. Show that the angle between any two of these vectors is 120 degrees. I proved this geometrically, but now my teacher wants a proof using vectors, and I don't know what to do.

More Similar Questions