In March 2004, a new world, Sedna, with a comet-like orbit and a perihelion over three times farther out than Pluto's was announced. What did this do to Pluto's status as a major planet?
What will be an ideal response?
Although Sedna is probably not part of Pluto's Kuiper Belt, but a member of the even more distant and scattered Oort Cloud, the fact that it is almost as large as Pluto definitely made Pluto's hold on "planet 9" status harder to defend.
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A certain organ pipe is open at both ends. Another pipe of the same length is open at one end and closed at the other. Which will have the lower pitch?
A. The pipe open at both ends. B. The pipe closed at one end. C. Both will have the same pitch. D. It depends on the pipes’ diameters.
In a mass-energy census of the universe, what are the approximate proportions of normal matter, dark matter, and dark energy?
A) 68% dark matter, 27% dark energy, 5% normal matter B) mostly normal matter, with only trace amounts of dark matter and dark energy C) 27% dark matter, 68% dark energy, 5% normal matter D) 33% dark matter, 33% dark energy, 33% normal matter
A certain ideal gas has a value of ? = 4/3. What is its molar specific heat at constant pressure?
A) 5R/2 B) 2R C) 3R D) 7R/2 E) 4R
A proton (+1.6 × 10^-19 C) moves 10 cm along the direction of an electric field of strength 4.0 N/C. The electrical potential difference between the proton's initial and ending points is:
a. 4.8 × 10^-19 V. c. 0.044 V. b. 0.40 V. d. 6.4 × 10^-19 V.