Given r1 = 3i - 2j + k, r2 = 2i - 4j - 3k, r3 = -I + 2j + 2k, find the magnitudes of (a)r3.

(b)r1 + r2 + r3.

(c)2r1 - 3r2 - 5r3

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Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

What are two different ways you could find the value of a? explain these methods.

Place me with this question is my last question