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Unformatted text preview: Solutions to Homework Assignment 4 MATH 24901 and 02 Section 12.4, Page 820 17, 912, 14, 15, 25, 26, 30, 31, 34, 35, 36, 45 4. < 1 , 1 , 1 > × < 1 , 1 , 1 > = < 1(1) (1)(1) , [1(1) 1(1)] , 1(1) ( 1)(1) > = < 2 , , 2 > . You can check the orthogonality. 6. < 1 , e t , e t > × < 2 , e t , e t > = < e t ( e t ) e t ( e t ) , [1( e t ) e t (2)] , 1( e t ) e t (2) > = < 2 , 3 e t , e t > . 9. Only (a), (c), and (f) are meaningful. The others are all attempting to take a cross product in which at least one factor is a scalar. 10.  u × v  = 5 · 10 sin(60 ◦ ) = 25 √ 3 . According to the righthand rule, it will be directed into the page. 12. (a) Since the zaxis is perpendicular to the xyplane, we have  a × b  = 3(2) sin(90) = 6 . (b) The cross product is in the xyplane, so the zcomponent is 0. It is also going to be in the second quadrant (using the righthand rule), so its xcomponent is positive and its ycomponent is negative....
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This note was uploaded on 04/07/2008 for the course MTH 249 taught by Professor Starr during the Spring '08 term at Willamette.
 Spring '08
 Starr
 Math

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