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Comment upon the statement:
A vector in XY plane can be split into only two components.


The given statement is wrong. A vector in XY plane can be split into more than two components. 
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What is the X-component of vector 3 straight i with hat on top space minus space 4 straight j with hat on top?

The x-component of the vector is 3. 

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Can a null vector have rectangular components of non-zero magnitude?

No. The magnitude of a null vector will always be zero.

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If l, m and n are the rectangular components of a vector, then what is the magnitude of vector?

Magnitude of the vector is given by, 

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#6 {main}</pre> in XY plane is straight A space sinθ comma then what is the second rectangular component of vector straight A with rightwards arrow on top ?


Second rectangular component is 

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