For this question, I already have the correct answer of t = 3. My question is, do we ignore because the number can only be 0 where lies on the -axis?If & & if is on the -axis, find the value of the scalar t.

Q.

Attempt:

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- Jan 16th 2013, 10:38 AMGrigOrig99Perpendicular Unit Vectors
For this question, I already have the correct answer of t = 3. My question is, do we ignore because the number can only be 0 where lies on the -axis?

If & & if is on the -axis, find the value of the scalar t.

Q.

**Attempt:**

- Jan 16th 2013, 12:16 PMrichard1234Re: Perpendicular Unit Vectors
Your error is that you shouldn't set equal to the zero vector (in fact this has no solutions). All you need to do is set the -component to zero so that lies on the j-axis.

We ignore the j-component, and obtain the equation

- Jan 16th 2013, 01:37 PMGrigOrig99Re: Perpendicular Unit Vectors
Ok, thanks for clearing that up.