First slide
Scalars and Vectors
Question

The angle between the two vectors A=3i^+4j^+5k^  and B=3i^+4j^5k^ will be

Moderate
Solution

A.B=(3i^+4j^+5k^).(3i^+4j^5k^)

        =9+1625=0

or       ABcosθ=0  or cosθ=0  or θ=900

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