Why do you suspect that for L > 0.6 m the free convection is unaffected by size?
What will be an ideal response?
This criteria applies mostly to free convection on a horizontal or slightly inclined
surface and the phenomena is probably due to the fact that molecules and
particles require space to move and 0.6 m seems to be a reasonable space for
recirculation of fluid along a horizontal surface.
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According to observations, what type of galaxy was much more common when the universe was 2 billion years old?
A) elliptical galaxies B) spiral galaxies C) irregular galaxies D) We can't say, because we are living at a time when the universe is 14 billion years old, not 2 billion years.
A 10-meter-long spear is thrown at relativistic speeds through a 10-meter-long pipe. (Both these dimensions are measured when each is at rest.) When the spear passes through the pipe
A) the spear appears to shrink so the pipe completely covers it. B) the pipe appears to shrink so the spear extends from both ends. C) both appear to shrink equally so the pipe barely covers the spear. D) any of these, depending on the motion of the observer (moving with the spear, at rest with the pipe, and so on). E) none of the above
____ shows that the building blocks of life form naturally under a wide range of circumstances
a. The Miller experiment b. The Chicxulub event c. The earliest fossils d. The Drake equation e. Stromatolites
A scuba diver has his lungs filled to half capacity (3 liters) when 10 m below the surface. If the diver holds his breath while quietly rising to the surface, what will the volume of the lungs be (in liters) at the surface? Assume the temperature is the same at all depths. (The density of water is 1.0 × 103 kg/m3.)
A. 5.9 B. 4.5 C. 6.4 D. 3.9 E. 3.1