Venus and Earth probably formed with similar amounts of carbon dioxide in their secondary atmospheres. Which of the following is true?
a. The majority of Earth's carbon dioxide escaped into space because of its hotter temperature, whereas Venus's carbon dioxide remains gravitationally bound to Venus.
b. The majority of Earth's carbon is now bound up in rock, whereas Venus's remains in its atmosphere.
c. Earth lost more of its secondary atmosphere because it was bombarded by more planetesimals than Venus.
d. The majority of Earth's carbon was absorbed by plants during photosynthesis.
e. Earth and Venus still have equal amounts of carbon dioxide in their atmospheres.
b. The majority of Earth's carbon is now bound up in rock, whereas Venus's remains in its atmosphere.
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When adding several quantities, the number of decimal places in the result must always be
A) larger than the number of decimal places in the most accurate of the quantities. B) equal to the number of decimal places in the most accurate of the quantities. C) equal to the average number of significant digits in the most and least accurate of the quantities. D) equal to the number of decimal places in the least accurate of the quantities. E) smaller than the number of decimal places in the least accurate of the quantities.
If a guitar string has a fundamental frequency of 500 Hz, which one of the following frequencies can set the string into resonant vibration?
A) 1750 Hz B) 750 Hz C) 1500 Hz D) 250 Hz
Given that the planet orbiting the nearby star 51 Pegasi is about 20X larger than the Earth, but 400X more massive, on that world you would weigh:
A) the same as you do here. B) twice as much as you do here. C) half as much as you do here. D) 20X more that you do here. E) 400X more than you do here.
The warmth you feel from the Sun at the beach is an example of __________
Fill in the blank(s) with correct word