If $\overrightarrow { \mathbf { A } } = 7 \tilde { \mathbf { i } } - 6 \hat { \mathbf { j } } + 5 \hat { \mathbf { k } }$

question 69

Multiple Choice

If $\overrightarrow { \mathbf { A } } = 7 \tilde { \mathbf { i } } - 6 \hat { \mathbf { j } } + 5 \hat { \mathbf { k } }$ , $| \overrightarrow { \mathbf { B } } | = 7$ ,and the angle between $\overrightarrow { \mathrm { A } }$ and $\vec { B }$ (when the two are drawn starting from the same point) is 60 $\degree$ ,what is the scalar product of these two vectors?

• A)-13
• B)+13
• C)+37
• D)-37
• E)73

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