Mars' atmosphere is mostly carbon dioxide. Why does it not experience a runaway greenhouse effect like Venus?
A) Mars is protected by its magnetic field.
B) Mars does not have enough additional water vapor to magnify the warming.
C) Mars' atmosphere is too thin.
D) Mars has a CO2 cycle like Earth that regulates the amount of carbon dioxide.
C) Mars' atmosphere is too thin.
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Three charges are placed as follows along the x- and y-axis of an xy-coordinate system: q1 = 2.00 ?C at x1 = 0 m, q2 = -4.00 ?C at x2 = 3.00 m, and q3 = 6.00 ?C at y = 4.00 m. What is the electric potential energy of this system of charges?
A) -40.2 mJ B) 40.2 mJ C) -94.2 mJ D) 94.2 mJ E) 0 J
An auditorium has dimensions 10 m × 10^ m × 60 m. How many moles of air fill this volume at one atmosphere and 0°C?
a. 2.7 × 10^2 b. 2.7 × 10^4 c. 2.7 × 10^3 d. 2.7 × 10^5 e. 2.7 × 10^6
You want to determine whether a mystery object is a neutron star or a white dwarf. Which of the following properties would demonstrate that it is definitely a neutron star?
A) It emits most strongly in visible and ultraviolet light. B) It is surrounded by a planetary nebula. C) Every decade or so, it erupts in a nova explosion. D) It dims and brightens more than twice per second.
Observationally, a key distinction between a white dwarf supernova and a massive-star supernova is that the spectrum of a massive-star supernova shows prominent hydrogen lines, while the spectrum of a white dwarf supernova does not. Why don't we see prominent hydrogen lines in the spectrum of a white dwarf supernova?
A) White dwarf supernovae occur so far away that their hydrogen lines become too dim to see. B) During a white dwarf supernova, all the white dwarf's hydrogen fuses instantly to make helium. C) White dwarfs are stellar corpses that contain little or no hydrogen, so they do not show hydrogen lines when they explode. D) The hydrogen lines of white dwarf supernovae are so redshifted that we cannot detect them.