Gino says that the analog of Gauss's law for the flow of an incompressible fluid of density ? at constant velocity 
is 
for an imaginary surface within the fluid. Lorenzo says that it is true only if the area where the fluid enters the surface and the area where it leaves the surface are both perpendicular to the velocity of the
fluid. Which one, if either, is correct?
A.
B.
is not equal to zero if the fluid enters or exits at angles other than 90°.C.
D.
E.
Answer: A
You might also like to view...
For a BCC crystal, which of the following x-ray (hkl) diffraction peaks is not present?
(a) (200) (b) (110) (c) (130) (d) (111)
Water ripples are produced by making a cork oscillate up and down at a frequency of 5 Hz. The peaks of the ripples are 0.03 meters apart. What is the speed of the water ripples?
A difference between the special and general theories of relativity is that
A. special relativity is valid only in stationary reference frames. B. special relativity deals with accelerated systems. C. general relativity deals with accelerated systems. D. general relativity only deals with swiftly moving objects.
Which interacts more with sounds of relatively high frequencies?
A) large bells B) small bells C) both the same