Find the Length and Direction (When Defined) of U × $3 ; \frac { 2 } { 3 } \mathrm { i } - \frac { 1 } { 3 } \mathrm { j } + \frac { 2 } { 3 } \mathrm { k }$

question 23

Multiple Choice

Find the length and direction (when defined) of u × v.
-u = 2i + 2j - k, v = -i + k

• A) \(3 ; \frac { 2 } { 3 } \mathrm { i } - \frac { 1 } { 3 } \mathrm { j } + \frac { 2 } { 3 } \mathrm { k }\)
• B) \(9 ; \frac { 2 } { 9 } \mathrm { i } + \frac { 1 } { 9 } \mathrm { j } - \frac { 2 } { 9 } \mathrm { k }\)
• C) \(3 ; \frac { 2 } { 3 } \mathrm { i } + \frac { 1 } { 3 } \mathrm { j } - \frac { 2 } { 3 } \mathrm { k }\)
• D) \(9 ; \frac { 2 } { 9 } \mathrm { i } - \frac { 1 } { 9 } \mathrm { j } + \frac { 2 } { 9 } \mathrm { k }\)

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