Consider the two force vectors D = (2.64 N)i + (-5.6 N)j + (2.75 N)k and F = (2.11 N)i + (2.8 N)j + ak. What should be the value of a, in units of N, so the two forces are perpendicular?

Principles of Physics: A Calculus-Based Text
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Chapter6: Energy Of A System
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Consider the two force vectors D = (2.64 N)i + (-5.6 N)j + (2.75 N)k and F = (2.11 N)i + (2.8 N)j + ak.

What should be the value of a, in units of N, so the two forces are perpendicular? 

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