Astronomers now speculate that a galaxy's shape depends on all of the following except
a. the rate of star formation.
b. the history of past collisions.
c. the mass.
d. All of the other choices may be important in determining a galaxy's shape.
d
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The energy of a photon is related to
A) the energy given to the atom that emits it. B) the energy transition in de-excitation. C) its frequency. D) all of the above E) none of the above
What is the focal length of a pair of contact lenses that will allow a person with a near point of 125.0 cm to read a newspaper held 25.0 cm from his eyes?
A) -100 cm B) -31.3 cm C) 10.2 cm D) 20.8 cm E) 31.3 cm
What is the ratio of the escape speed of a rocket launched from sea level to the escape speed of one launched from Mt. Everest (an altitude of 8.85 km)? The radius of the earth is 6.38 × 106 m
A) 1.0007 B) 1.0014 C) 1.0001 D) 0.9986 E) 0.9993
Which of the following is a Kuiper Belt Object that is quite large and has about the same diameter as Pluto but is 27% more massive?
A) Titan B) Io C) Eris D) Nereid