Sedimentary rocks provide clues about past geologic events and settings. A low energy, quiet environment such as a lagoon or lake bed provides the perfect setting for the formation of
A) sandstone and shale.
B) shale and evaporites.
C) arkose and dolomite.
D) none of these
Answer: B
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How do observations of distant galaxies help us learn about galaxy evolution?
A) Observations at different distances show galaxies of different ages and therefore different stages of evolution. B) We can observe the birth of galaxies. C) We can observe the evolution of a single galaxy over time. D) We can observe two galaxies merging and what the result is, helping us learn how mergers affect evolution. E) We can see what our galaxy used to look like and therefore theorize about the physical processes that led to its current appearance.
A 2.00-kg mass is placed at (3.00, 4.00) m, and a 3.50-kg mass is placed at (3.00, ?4.00) m. What is the moment of inertia of this system of masses about the z axis?
a. 138 kg·m2 b. 16.5 kg·m2 c. 88.0 kg·m2 d. 49.5 kg·m2 e. 22.0 kg·m2
The distance between the object and the eyepiece of a compound microscope is 25.0 cm. The focal length of its objective lens is 0.200 cm and the eyepiece has a focal length of 2.60 cm
A person with a near point of 25.0 cm and a far point at infinity is using the microscope. (a) What is the angular magnification obtainable using the eyepiece alone as a magnifying lens if the final image is at the person's far point? (b) What is the total magnification of the microscope when used by the person of normal eyesight?
A sprinter runs 100.0 m in 9.87 seconds. If he travels at constant acceleration for the first 75.0 m and then at constant velocity for the final 25.0 m, what was his peak velocity?
A. 17.7 m/s. B. 15.4 m/s. C. 20.3 m/s. D. 17.5 m/s.