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vectors

muskan
in Homework Help

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I know only a little about components of vectors. I have tried to solve it. But I have failed. Please help me in 16 to 19 questions.

The dot product of two orthogonal vectors is zero.

A.B=|A||B|cos a, here A and B are vectors, and a is the angle between them.

 

These are two hints to solve the problems.

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