Copernicus' Heliocentric theory explains that
A) the Sun lies at one focus of an ellipse.
B) all planets lie between the Sun and Earth.
C) Mars will retrograde when it reaches a certain position on its epicycle.
D) Venus retrogrades when she overtakes us at inferior conjunction.
E) planetary orbits are elliptical in shape.
D
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A piece of glass has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film
If the wavelength of light incident on the film is 560 nm and the indices of refraction of gasoline and glass are 1.40 and 1.50, respectively, what is the minimum nonzero thickness of the film to see a bright reflection? A) 500 nm B) 400 nm C) 300 nm D) 200 nm E) 100 nm
A fluid at 40ºC flows at 8 m/s along a flat plate that is 3 m long. The plate is maintained at 100ºC. Determine the local convective heat transfer coefficient and the average convective heat transfer coefficient using 4 x 105 as the critical Reynolds number, for
a) Air at 100 kPa b) Water at 100 kPa
How do we test our computer models for the interior of the Sun?
A) taking movies of the solar prominences and flares B) sending a probe to the Sun to plunge into its interior C) monitoring the helium content of the surface of the Sun D) comparing model predictions to how the Sun actually vibrates
As we look at larger and larger scales in the universe, we find
A) a larger and larger percentage of the matter is dark. B) almost exclusively visible matter. C) a larger and larger percentage of the matter is visible. D) smaller and smaller masses. E) an equal amount of visible and dark matter.