Which terrestrial planet has the highest-pressure (thickest) atmosphere?
a. Mercury
b. Venus
c. Earth
d. Mars
b
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A lens of focal length 10 cm is placed in contact with a lens of focal length -15 cm. What is the focal length of the combination?
A. -15 cm B. 6.0 cm C. 7.5 cm D. -5.0 cm E. 30 cm
What observation has prompted astronomers to ponder the possible existence of dark energy?
a. discovery of quasars b. discovery of superclusters c. supernovae appear fainter than expected at large redshifts d. uniform nature of the cosmic microwave background (CMB)
Which of the following statements describes a polar molecule?
A) The electrons in the molecule are distributed evenly throughout the molecule. B) The molecules are usually not attracted to one another very strongly. C) Polar molecules have the weakest intermolecular interactions with ionic compounds. D) The molecules have a high degree of symmetry. E) None of these statements describe polar molecules.
Helioseismology maps of rotation in the Sun's interior show that its internal gases rotate with equal periods
a. True b. False Indicate whether the statement is true or false