��CH2 - Exe rcises 1. (a) 4.1 m along the +x...

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Unformatted text preview: Exe rcises 1. (a) 4.1 m along the +x axis ; (b) 3.2 m at 70 to the +x axis 8. R x =4 sin 40 3 cos 20 = 5.39 m, R y = 4 cos 40 3 sin 20 = 2.04 m, R = 5.76 m at 20.7 N of W. 10. R = 12.1i 5 j m, or R = 13 m at 22.6 S of W 23. The vector joining the tip of B to the tip of A is A B . Since C is to the midpoint of this vector, C = A + (B A ) / 2 = (A + B )/2. 24. Since A + B = 2i + 3 j is at 56.3 to the x axis, C must be at 56.3 to the y axis. We merely interchange the values of the components. Thus, C = 3i + 2 j or 3i 2 j . 25. S =12i + j + 5k , and S = (170) 1/2 , so S /S = 0.920i + 0.077 j + 0.383k 45. A a i = A x = A cos , thus cos = A a i / A, etc. cos = A a i / A = 3 / (14) 1/2 , thus = 36.7; cos = A a j / A = 2 / (14) 1/2 , thus = 57.7; cos = A a k / A = 1 / (14) 1/2 , thus = 74.5. 53. A = 2.83i + 2.83 j , B = 1.5 j + 2.6k ....
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This note was uploaded on 05/01/2011 for the course ELECTRIC MAT351 taught by Professor Ahmettantuni during the Spring '10 term at Abant İzzet Baysal University.

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��CH2 - Exe rcises 1. (a) 4.1 m along the +x...

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