HW21_solns - 4 ◦ 6(a 5/2 km(b(5 2 4(c t = 1 2 hr 7(a 1...

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HW 21 Solutions 1. (a) i) 2 ~ i + 3 ~ j , ii) 1 13 (2 ~ i + 3 ~ j ), iii) 6 13 (b) i) 3 ~ i + ~ j , ii) 1 10 (3 ~ i + ~ j ), iii) 4 10 2. (a) 11 5 (b) 5 26 3. (a) 27 (b) 90 4. (a) i) - 20 ~ i + 5 ~ j + 4 ~ k , ii) 1 21 ( - 20 ~ i + 5 ~ j + 4 ~ k ), iii) 3 (b) i) - ~ i , ii) - ~ i , iii) 16/13 5. 42
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Unformatted text preview: . 4 ◦ 6. (a) 5/2 km (b) (5 / 2 , 4) (c) t = 1 / 2 hr 7. (a) 1 3 (2 ~ i + 2 ~ j + ~ k ) (b) x =-1 3 (c) ~u reflected =-5 9 ~ i + 13 9 ~ j-7 9 ~ k 1...
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