Discussion
The dot product of two vectors is
Answer: B
Correct answer: a scalar equal to the product of their magnitudes and the cosine of the angle between them
\[ \mathbf{A}\cdot\mathbf{B} = AB\cos\theta. \] The result is a number, not a vector, and it measures how much of one vector lies along the other - which is why it appears wherever a projection or a component is wanted, as in work done or flux through a surface.
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