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Classical Mechanics

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Difficult

Angle Between Vectors

CLMECH-F7HVEC

Find the angle between vector:

$$\vec { A } =-7\hat { i }+5\hat { j } +9\hat { k }$$

...and vector:

$$\vec { B } =4\hat { i } +6\hat { j } -4\hat { k }$$

A

${71 }^{ o }$

B

${ 109 }^{ o }$

C

${ 149 }^{ o }$

D

${31}^{ o }$