Question: (a) Is the vector (i + j + i) a unit vector? Justify your answer. (b) Can a unit vector have any components with magnitude

(a) Is the vector (i + j + i) a unit vector? Justify your answer.
(b) Can a unit vector have any components with magnitude greater than unity?
Can it have any negative components? In each case justify your answer.
(c) If A = a (3.0i + 4.0j), where a is a constant, determine the value of a that makes 1 a unit vector.

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