4. Vector a is equal to 6 units, vector b is 10 units, and the angle between them is 60. Find: 1) their scalar-product? 2) Their cross-product? 5. If a vector component is a = 3 and ay = 4, the two components of a vector b are bx = 2 and by = 5. Find: a) The resultant components a + b? b) The magnitude of the resultant of a + b? c) The two components of the vector a-b? d) The magnitude of the vector a-b 6. The diagram shows that a set of forces act on a boat. Find the magnitude and direction of the resultant F=1500 N F-1000 N F-2000 N 25 F-3000