63_Physics ProblemsTechnical Physics

63_Physics ProblemsTechnical Physics - 64 P3.29 Vectors We...

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64 Vectors P3.29 We have BRA =− : A A R R x y x y = = = = 150 75 0 150 120 130 140 35 0 115 140 35 0 80 3 cos120 cm cm cm cm . sin cos . sin . . Therefore, FIG. P3.29 Bi j i j B −+ = =+ = F H G I K J ° 115 75 80 3 130 190 49 7 190 49 7 196 49 7 190 14 7 22 1 af ej ± . ±± . ± . tan . .. cm cm θ P3.30 A i j + 870 150 . ± . ± and Bij 13 2 6 60 . ± . ± AB C += 30 : 32 1 9 2 1 6 730 720 CBA i j Cij =− = . ± . ± . ± . ± or C x = . c m ; C y = c m P3.31 (a) A B ij += − + − = − 4 26 ±± ±± (b) AB i j =−− −= + 4 42 (c) += + = 26 6 3 2 . (d) = 42 4 4 7 . (e) + = F H G I K J = °= ° tan . 1 6 2 71 6 288 = F H G I K J tan . 1 2 4 26 6
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