If Venus once had an ocean, where did it go?
A) It exists as abundant water vapor in the planet's atmosphere.
B) It was lost to space, stripped away by the solar wind.
C) The water broke into hydrogen, which escaped to space, and oxygen, which became trapped in the planet's surface rocks.
D) It exists trapped in the crust but below the surface.
E) It is found in the cooler polar regions, like at the Moon and Mercury.
C
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The drag on an airplane wing in flight is known to be a function of density of air (??? viscosity of air (?), free-stream velocity (U?, characteristic dimension of the wing(S) and the shear stress on the surface of the wing (Ts).
Show that the dimensionless drag
can be expressed as a function of the Reynolds number
GIVEN
An airplane wing in flight
Drag on wing
FIND
What effect or effects would be most significant if the Moon's orbital plane were exactly the same as the ecliptic plane?
A) Solar eclipses would be much rarer. B) Solar eclipses would be much more frequent. C) Total solar eclipses would last much longer. D) both A and C E) both B and C
One of Einstein's postulates in formulating the special theory of relativity was that the laws of physics are the same in reference frames that
A) accelerate. B) move at constant velocity with respect to an inertial frame. C) oscillate. D) are stationary, but not in moving frames.
The resistance of a conducting material depends on its
a. composition b. length c. diameter d. temperature e. all of the above