1. Susan pulls on a rope a sleigh with a force of 120 N. If the rope makes an angle of 25 with the horizontal, what is the force that tends to lift the sleigh? a) 120.00 N c) 50.71 N b) 10876 N d) 84.85 N 2. An airplane is heading north with an airspeed of 400 kin/h. The plane encounters a Wind from the east at 100 km/h. What is the magnitude of the resultant ground velocity? a) 387 km/h c) 412 km/h b) 400 km/h (:1) 500 km/h 3. If a . b = 8, then what is b . a equal to ? a) 8 c) 1/8 b) -8 d) More information is required. 4. To the nearest degree, What is the angle between the vectors (1, 2, 0) and (-3, 2, 1)? a) 0" c) 83" b) 42 (1) 107 5. Given that the vectors a = t6, -2, 28) and b = (-1, 8+1 , 2) are perpendicular , what is the value of s ? a) -4 C) 0 b) 1 d) 4 6'. If ABC is a triangle with vertices A(0,l), B(2,0), and C(33), then What is the vector projection of AB on AC ? 3) i(3=2) C) 4_(29'1) 13 13 5 5 7. Suppose a = (4, -6, 10) and b = (6, 9, -15) . What is a x b