The pressure drop in 10 m of a turbulent flow in a pipe is 200 Pa. The time-average velocity in the pipe at three radial locations is measured to be:
The eddy viscosity at r = 25 mm is nearest (neglect the kinematic viscosity):
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Suppose you and your sister travel at different speeds in space and you note a slowing of her clock. Compared with her clock your sister will notice that your clock runs
A) faster. B) slower. C) the same. D) need more information
Which of the following is one of the sources of the atmospheric ozone problem?
A) coal-fired generating plants B) cutting down forests C) certain types of air-conditioner coolant D) nuclear power plants E) All of the above.
Lobsters live on the bottom of the ocean, which means their density is
A) greater than the density of sea water. B) equal to the density of sea water. C) less than the density of sea water.
The remaining core of a planetary nebula is called a _______________
a. white dwarf b. neutron star c. black hole d. red giant