The following are multiple-choice or multiple select questions. There may be more than one possible correct response, and you should choose all responses that you think are correct, but wrong responses will be penalized. For each part, however, the minimum score is a zero, so that penalties do not carry over. A. The concept of a streamline is important in describing fluid flow. a. b. c. d. e. f. A streamline traces the path of a specific fluid particle over time. A streamline will be identical to a pathline and a streakline if the flow is steady. At every point on a streamline, the acceleration vector is tangential to the streamline at that point. In a streamline coordinate system, the acceleration must be zero in the normal direction. At every point on the streamline, the velocity vector is tangential to the streamline at that point. At every point on a streamline, the velocity vector is perpendicular to the streamline at that point. B. A flow in a conduit, with straight and parallel streamlines, is shown. The two points A and B are on the same streamline. a. The flow must be steady and uniform. b. The flow must be unsteady