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# Dot Product of Vectors

The dot product (also known as the scalar product) is an operation on vectors that can tell you the angle between the vectors.

**Note:** The figure is not drawn to scale.

If \(\vec{u}, \vec{v},\) and \(\vec{w}\) are vectors, then which of the following is not a valid operation?

\[ \begin{align*} \text{A. } & \hspace{.35cm} (\vec{u}\cdot\vec{v}) + |\vec{w}| \\ \text{B. } & \hspace{.35cm} \vec{u}\cdot\vec{v}\cdot\vec{w} \\ \text{C. } & \hspace{.35cm} \vec{u}\cdot(\vec{v} - \vec{w}) \end{align*}\]

Remember! Both inputs for a dot product must be vectors.

If the vectors \(\vec{v}=(\sqrt{3},4,\sqrt{2})\) and \(\vec{u}=(\sqrt{6},0,k)\) are perpendicular, what must be the value of \(k?\)

Hint: If two vectors are perpendicular, then their dot product is 0.

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