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Vector Product watch

1. How would I simplify:

A x (B + C) • B

My working is:

= (A x B + A x C) • B
= (A x B • B) + (A x C • B)

Where do I go from here?

The answer is meant to be:

A x C • B

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2. (Original post by SherlockHolmes)
How would I simplify:

A x (B + C) • B

My working is:

= (A x B + A x C) • B
= (A x B • B) + (A x C • B)

Where do I go from here?

The answer is meant to be:

A x C • B

Posted from TSR Mobile
A x B is __________ to B.

The dot product of ________ vectors is __.
3. (Original post by BabyMaths)
A x B is __________ to B.

The dot product of ________ vectors is __.
A x B is parallel to B?

The dot product of parallel vectors is 0?

Why is 'The dot product of parallel vectors is 0' true?

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4. (Original post by SherlockHolmes)
A x B is parallel to B?

The dot product of parallel vectors is 0?

Why is 'The dot product of parallel vectors is 0' true?

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No.

No.

It isn't true.

Did you just guess? You're on the internet. Guessing is not necessary.
5. (Original post by BabyMaths)
No.

No.

It isn't true.

Did you just guess? You're on the internet. Guessing is not necessary.
No I did not guess... I was thinking of the 'x' as multiply rather than cross product hence I thought A x B was a multiple of B and came to the conclusion that the dot product of two parallel vectors is 0 and was confused.

I will correct my statements:

A x B is perpendicular to B.

The dot product of perpendicular vectors is 0.

Posted from TSR Mobile
6. (Original post by SherlockHolmes)
No I did not guess... I was thinking of the 'x' as multiply rather than cross product hence I thought A x B was a multiple of B and came to the conclusion that the dot product of two parallel vectors is 0 and was confused.

I will correct my statements:

A x B is perpendicular to B.

The dot product of perpendicular vectors is 0.

Posted from TSR Mobile
Now you are correct.

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Updated: November 20, 2013
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