400 cm3 of mercury at 0°C will expand to what volume at 50°C? Mercury has a volume expansion coefficient of 180 × 10-6/C°
A)
450 cm3
B)
422.8 cm3
C)
409.7 cm3
D)
403.6 cm3
E)
401.8 cm3
D
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Which of the following was an important source of prebiotic molecules (e.g., amino acids) on the early Earth?
A) molecules produced on the surface by impacts B) molecules produced by chemical reactions near deep-sea ocean vents C) molecules transported to the surface by impacts D) all of these
The transit method searches for extrasolar planets by
A) monitoring stars for slight dimming that might occur as unseen planets pass in front of them. B) obtaining high-resolution photographs of other star systems. C) observing Doppler shifts in a star's spectrum caused by an unseen planet. D) looking for slight back and forth shifts in a star's position in our sky.
Why is most matter electrically neutral?
a. It contains no charges. b. There are equal amounts of positive and negative charges present. c. The charge on the electrons and protons in the material is too small to notice. d. none of the above
If an extrasolar planet suddenly became larger in radius, but kept the same mass and orbit, what would change during an observed transit?
A) The amount of starlight would have a larger dip during the transit. B) The amount of starlight would have a smaller dip during the transit. C) The time between transits would decrease. D) The time between transits would increase. E) Nothing. The radius of a planet does not affect the appearance of a transit.