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Why is hati.hatj=hatj.hatk=hatk.hati=0...

Why is `hati.hatj=hatj.hatk=hatk.hati=0`

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The angle between `hati` and `hatj,hatj` and `hatk` and `hatk` and `hati=90^(@)` and `cos 90^(@)=0` Hence `hati.hatj=i.jcos90^(@)=0`
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SUBHASH PUBLICATION-MOTION IN PLANE-NUMERICALS WITH SOLUTIONS
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  14. If a vectorvecA makes an angle of 60^(@) with respect to the X-axis, t...

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  15. Find the cross product of vecA=3hati+4hatj and vecB=(-3hati+4hatj)

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  16. If a force vecF=(-3hati+4hatj+2hatk) acts on a body and displaces it s...

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  17. Find the angle between2(hati+hatj) and hati

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  18. If vecA=3hati+2hatj and vecB=4hatj-5hatk then find |vecA+vecB|

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  19. If vecA=3hati+2hatj and vecB=4hatj-5hatk then find |vecA-vecB|

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  20. Find the sum of hati and hatk and the angle between the resultant and ...

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