Geological evidence points to a history of extended ice ages in Earth's history. How did Earth recover from this snowball phase?
A) The increased ice coverage on Earth's surface absorbed more sunlight than water and rocks, thus gradually heating Earth until the ice melted.
B) Life vanished, leading to an increase in CO2, and increased global warming, eventually melting the ice.
C) Volcanoes continued to inject CO2 into Earth's atmosphere, increasing the greenhouse effect to the point where ice melted.
D) Plate tectonics gradually subducted all the ice below Earth's surface.
E) As the Sun aged, it grew brighter and increased Earth's temperature, melting the ice.
C
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Toronto, Canada and Santiago, Chile have similar longitudes but very different latitudes. Which of the following is true about how observers in those cities will view the constellation Orion, which is located approximately on the celestial equator?
A) Orion will cross the meridian at about the same local time in both cities, but at different altitude and direction. B) Orion will cross the meridian at the same altitude and direction in both cities, but at different local times. C) Orion will cross the meridian at the same altitude and direction and at about the same local time in both cities. D) If Orion is visible in the night sky in one city, then the other city will need to wait a few months to see Orion in its night sky.
Two point charges of +2.0 ?C and -6.0 ?C are located on the x-axis at x = -1.0 cm and x = +2.0 cm respectively
Where should a third charge of +3.0-?C be placed on the +x-axis so that the potential at the origin is equal to zero? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) x = 4.0 cm B) x = 1.0 cm C) x = 2.0 cm D) x = 3.0 cm E) x = 5.0 cm
Which kind of interstellar spacecraft would require the crew to be placed in suspended animation, perhaps for thousands of years?
A) solar sail B) interstellar ark C) matterantimatter rocket D) nuclear rocket
The density of air is 1.29 kg/m3. What is the mass of the air inside a room 4.0 m × 3.0 m × 2.0 m?
A) 0.32 kg B) 3.1 kg C) 31 kg D) 1.9 kg E) 19 kg