Question

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If vector A = 3i + 4j + 5k, then the component of A vector along x-axis is?
Here i, j and k denote i cap, j cap and k cap respectively.
Explanation required...​

Answer 1

To find the component of a vector along any direction, just do a dot product of it with the unit vector along that direction.

So, for your case, Ax = A . i (i-cap, unit vector along x) = 3 X 1 = 3