Which of the following best describes the predominant scientific view of the origin of life on Earth?
A) Life probably migrated to Earth from some other world.
B) We may never know precisely how life arose, but current evidence suggests that life probably can arise naturally under the conditions that prevailed on the early Earth.
C) Life arose through a series of extremely unlikely chemical coincidences, making it seem almost miraculous that life ever came to exist at all.
D) We can describe with great certainty the precise steps by which life arose on Earth.
B
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Why is it easier to see fine print in brighter light than in dimmer light?
a. This is not so, it is easier to see fine print in dimmer light than in brighter light. b. Because the power (in diopters) of the eye increases as the light intensity increases. c. In brighter light, the longer wavelengths dominate. d. In brighter light, the f-number of the eye increases.
A baseball outfielder throws a baseball of mass 0.36 kg at a speed of 34.0 m/s and initial angle of 30°. What is the kinetic energy of the baseball at the highest point of the trajectory? Ignore air friction
a. zero b. 312 J c. 156 J d. 52.0 J e. 208 J
When a diffraction grating having 5000 lines/cmis illuminated by monochromatic light, the angle between the central maximum and the fourth order maximum is 47.2°. What is the wavelength of the light?
A) 367 nm B) 183 nm C) 138 nm D) 637 nm
Which of the following statements is false?
a. The majority of surface rocks are igneous. b. The study of rocks is called petrology. c. Rocks are classified as igneous, sedimentary, or metamorphic. d. Rocks are composed of one or more minerals.