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2.11 Gabarito - Lista 2 1. −→x = (18 3 , 11 3 ,− 11 3 ) 2. −488,−68 3. 11,−4 4. 2u.c. 5. 5u.c. 6. −→v = (4,12,− 4) 7. (−2,4,−√5), 1 9 (10,11,− 2), 1 17 (0,5,− 3) 8. proj−→c −→m = 23 11 (3,1,1); proj−→ j −→ b = (0,1,0) 9. (−1 2 , 1 2 ,0) 10. θ = arcos( 4√ 5 √ 6 ); θ = arcos(− 1√ 2 √ 13 ) 11. Â : θ = arcos( 1√ 5 ); B̂ : θ = arcos( 3 5 ); Ĉ : θ = arcos( 1√ 5 ) 12. √ 152; (132,− 72,− 84); (−14,− 12,− 14) 13. (−13,6,3) 14. √ 72u.a.; 3u.c. 15. √ 98 = 7 √ 2u.a. 16. −→w e −→u sa˜o paralelos. 17. −56;−56 18. (a) 4 3 ; (b) 2 3 ,−1 19. 41u.v.; h = 41√ 105 = 41 √ 105 105 u.c. 64 20. 49 6 ≅ 8,17u.v. 21. 105u.v. 22. 16u.v. 23. m = 6 24. proj−→v −→u = (−→u · −→v −→v −→v ) −→v ; |(−→u ,−→v ,−→w )| 25. 604u.v. 26. 11,− 1 27. (1,1,2) 28. (1,1,1) 65
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