# Mechanics: Scalars and Vectors

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1. Given the following 3 vectors, all of which lie in the horizontal plane, (see attachment for list of vectors), find:

(a) 3A-B

(b) 1) A?B 2) B?A

(c) 1) A*B 2) B*A

(d) (5A-6B+4C)?(B*C-A*B)

*(Please see attachment for complete question and equations)

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#### Solution Preview

Please see attached file

For the example

A Â· B = |A| |B| cos ( A - B) = 3 Ã— 5 cos -20Â°, cos -20Â° is not equal to cos(20),

Then A Â· B=3*5*0.9397=14.1.

The calculator uses radian of the angle instead of degree.

a. Given the following ...

#### Solution Summary

This shows how to perform operations on vectors.

$2.49