Free Fall: A ball is thrown downward from the top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the building, assuming negligible air resistance?
A. 20 m
B. 30 m
C. 50 m
D. 70 m
Answer: D
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Which of the following are the two key starting assumptions of theoretical models of galaxy evolution?
A) (1) The beginning of the universe can be modeled as a giant supernova explosion and (2) this supernova created all the elements in the proportions we find them today. B) (1) Hydrogen and helium gas, along with dark matter, filled all of space and (2) some regions of the universe were slightly denser than others. C) (1) Hydrogen and helium gas, along with dark matter, filled all of space and (2) the distribution of this material was perfectly uniform everywhere. D) (1) Hydrogen gas, along with dark matter, filled all of space and (2) all the other elements came from stars.
What happens when an electron in an atom absorbs a photon?
A. The electron moves to the nucleus. B. The electron moves to a lower energy level. C. The electron turns into a proton. D. The electron moves to a higher energy level.
Which has the events in the right order, from early to late?
A.) Star formation, quark soup, protons form, atoms form, nucleosynthesis. B.) Quark soup, protons form, nucleosynthesis, atoms form, star formation. C.) Nucleosynthesis, star formation, protons form, atoms form, quark soup. D.) Quark soup, atoms form, star formation, protons form, nucleosynthesis. E.) Atoms form, star formation, protons form, quark soup, nucleosynthesis.
The first-quarter phase of the Moon in the Northern Hemisphere occurs at the time of the third-quarter phase in the Southern Hemisphere.
Answer the following statement true (T) or false (F)