The pressure force on a submerged surface (fluid motionless): Decreases with dep

Question

The pressure force on a submerged surface (fluid motionless): Decreases with depth of submersion Varies only horizontally Is determined from the pressure at the centroid Acts at the centroid. Both c and d None of above Acceleration in the x-direction of a water container open to the atmosphere: Does not affect the pressure distribution in the fluid Causes a surface slope in the fluid that balances the acceleration Causes a partial differential p/partial differential x at the container bottom Acts at the centroid. Both d and c Both band c A streamline: Coincides with a streakline but not a pathline in unsteady flow Coincides with a pathline but not a streakline in unsteady flow Coincides with a pathline or streakline in steady flow Varies with time in steady flow Doesn't exist in unsteady flow None of the above The convective(or advective) derivative of the velocity U in a steady flow field: Could be equal to the local acceleration Is zero Relates Eulerian and Lagrangian accelerations Is equal to DV/Dt Both a, c and d Both c and d Surface tension sigma is: Force/area A result of molecular forces Energy Area Force/volume Both b and c None of the above

Explanation / Answer

6) The pressure force on a submerged surface

c) Is determined from the pressure at the centroid

d) Acts at the centroid.

7) Acceleration in the x-direction of a water container open to the atmosphere:

b) Causes a surface slope in the fluid that balances the acceleration

c) Causes a dp/dx at the container bottom.

8) A streamline :

c) Coincides with a pathline or streakline in steady flow.

9) a) could be equal to the local accleration

c) Relates Eulerian and Lagrangian accelerations

d) Is equal to dv/dt

10) Suface tension is

b) A result of molecular forces

c) Energy/Area

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