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Old Tuesday, May 12, 2015
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Question numerical that is bothering me.

If A = A_1^i + A_2 i + A_3 j and B = B_1 i + B_2 j + B_3 k, then prove that A,B = A_(1 ) B_1 + A_2 B_2 + A_3 A_3
Somebody please solve it and also which type of numerical is this.
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Old Tuesday, May 12, 2015
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Its a simple vector numerical.
1. Multiply A with B and i*i=-1 j*j=-1
2. Then take magnitude and the statement will be proved.
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[IMG][/IMG]
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@ love reflector

u sure one can write i squared and j squared? aren't they vectors which require to be written as i.i and j.j?
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Old Tuesday, May 12, 2015
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Post Solution



Please use the vector notation. Furthermore, iota-squared = -1 is an incorrect notion here in this context. Please do not solve it the way you have done in FSc or, maybe, in A-levels.

"i" has nothing to do with iota. It is just a direction vector(unit vector) along the x-axis.

Regards.
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Sorry my mistake and dear just take the magnitude rest is ok.
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Old Wednesday, June 17, 2015
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well i think vectors are cross products and scalers are dot products. mentioned wrongly in above paper
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Old Wednesday, June 17, 2015
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Post Dot/Cross products

Quote:
Originally Posted by doctorali View Post
well i think vectors are cross products and scalers are dot products. mentioned wrongly in above paper
What!? Vectors are cross products, and scalars are dot products!?

Sorry buddy! You have taken vectors and scalars wrongly!

Please come out of the FSc/A-level's physics; otherwise, you score will be ruined for sure!

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Originally Posted by lovereflector View Post
[IMG][/IMG]
Bro, at the end where you have taken the magnitude needs your attention. You cannot cancel the squared-power of each term with the (1/2) of square-root isolately. You are violating the rules of squareroot.
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