The concept of a streamline is important in describing fluid flow. Which of the

Question

The concept of a streamline is important in describing fluid flow. Which of the following is true? (only a single answer is correct) A At every point on a streamline, the acceleration vector is tangential to the streamline at that point. B In a streamline coordinate system, the acceleration must be zero in the normal direction. A streamline will be identical to a pathline and a streakline if the flow is uniform at every instant of time. D A streamline traces the path of a specific fluid particle over time. At every point on the streamline, the velocity vector is tangential to the streamline at that point. D At every point on a streamline, the velocity vector is perpendicular to the streamline at that point.

Explanation / Answer

1) Option E is correct. Stream lines are the lines such that tangent at any point represents the velocity vector of the fluid particle at that time.

2) Option B is correct. Because flow is varying with time so, unsteady and flow is constant with respect to space hence unform.

3) Option B is correct. Path lines are the actual path traced by the particle and the streak lines are the locus of the different paticles passing trough same point. Hence both representing same, pathlines and streak lines are coincide.

4) Option E is correct. When we fixed the space, and measuring velocity at any time, it will be same. Hence it is steady flow.

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