2. Vectors A and B form a 30 angle. A = 3 and B = 5. What is |A - B ? a. 10.02 C. 6 E. None of the above b. 2.83 d. 36 3. k(a + b) = ka + kb conveys which property of vectors? a. commutative property of addition C. distributive property of addition b . associative property of addition d. none of the above 4. What is the direction cosine for the vector (7, 4, -3) with the negative z-axis? 3 a. 74 74 e. None of the above b d. 74 5. Two forces of 4N and 5N act on an object and their corresponding force vectors have a dot product of 6. What is the angle between the two vectors? a. 17.46 c. 23.58 e. None of the above Page 219 Full Name of Student: ID # b . 72.540 d. 62.730 6. Suppose a and b are vectors such that a x b = (1,0,2). What is b x ( - 2a) ? a. ( - 2,0, -4) C. ( 1,0,2) e. None of the above (2,0,4) d. ( - 4, 0, - 2) 7. The points A(1, 2, 3), B(2, 2, 3), and C(3, 5, 7) form a triangle. What is the area of ABC? a. 5 5/2 e. None of the above b 25 25/2