Question

1. To model a gasoline spill in a river, emergency responders measure the speed of the leading edge of the spill, while engineers set up a computer model that simulates the velocity field for the entire river. Which of the following is true? a. The emergency responders are using an Eulerian approach and the engineers are using a Lagrangian one. b. The emergency responders are using a Lagranglan approach and the engineers are using an Eulerian one c. Both are using an Eulerian approach. d. Both are using a Lagrangian approach. 2. A firefly (or lightning bug) is a small insect that emits a light from its abdominal region at certain intervals. If you are watching a single firefly at night by tracking the blinking light, would that be an example of: a. a streakline b. a pathline c. a timeline d. a streamline 3. The equation av als -0 describes what type of flow? a. unsteady b. uniform C. laminar d. steady V + dV di defines acceleration. Considering that dV dV 4. The equation à dt ds definition, what is a. The local acceleration term(s)? b. The convective acceleration term(s)? C. The centripetal acceleration term(s)? 5. Is temperature an extensive or intensive property?

Answer 1

(1) Ans.(a) Reason In Eulerian approach the reference point is fixed in this ease edge of spille (2) Ans. (b). Reason Pathline is path traced by a particle in a given interval, here the particle is light bug. (3) Ans. (b) Reason av to a velocity doesn't vary with space to uniform frow. ده (A) (al Local acceleration: dv * dt (b) Convective acceleration: vdu (e ) Centripetal acceleration : st since it is 1 is an intensive property, (5) Temperature independent of mass of body.