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Find the Length and Direction (When Defined) of U ×

Question 81

Multiple Choice

Find the length and direction (when defined) of u × v.
- u=12i+32j+k,v=i+j+2k\mathbf { u } = - \frac { 1 } { 2 } \mathbf { i } + \frac { 3 } { 2 } \mathbf { j } + \mathbf { k } , \mathbf { v } = \mathbf { i } + \mathbf { j } + 2 \mathbf { k }


A) 22;22i+22j22k2 \sqrt { 2 } ; - \frac { \sqrt { 2 } } { 2 } \mathbf { i } + \frac { \sqrt { 2 } } { 2 } j - \frac { \sqrt { 2 } } { 2 } \mathbf { k }
B) 8;14i14j+12k8 ; \frac { 1 } { 4 } \mathbf { i } - \frac { 1 } { 4 } \mathrm { j } + \frac { 1 } { 2 } \mathbf { k }
C) 23;33i+33j33k2 \sqrt { 3 } ; \frac { \sqrt { 3 } } { 3 } \mathbf { i } + \frac { \sqrt { 3 } } { 3 } \mathbf { j } - \frac { \sqrt { 3 } } { 3 } \mathbf { k }
D) 8;12i14j14k8 ; \frac { 1 } { 2 } \mathbf { i } - \frac { 1 } { 4 } \mathbf { j } - \frac { 1 } { 4 } \mathbf { k }

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