Express 25,000 m in kilometers
25.0 km
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Vision Problems: What power contact lens must be used to correct the vision of a nearsighted person whose far point is 40 cm?
A. +2.5 diopters B. -2.5 diopters C. -3.6 diopters D. -4.0 diopters E. +4.0 diopters
Which model of light is discussed in Chapter 17?
A. Ray model B. Photon model C. Wave model D. Solar model
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.
The type of nuclear reaction taking place in stars is
a. cold fusion. b. fusion. c. fission. d. beta decay.