If a 1 050-kg car was moving at 25 m/s, what would be its kinetic energy expressed in the unusual (for kinetic energy) units of calories? (1 cal = 4.186 J)
a. 3.1E+5
b. 3.3E+5
c. 6.6E+5
d. 7.8E+4
e. 6.3E+3
d
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The period of oscillation of a near-Earth satellite (neglecting atmospheric effects) is 84.3 min. What is the period of a near-Moon satellite? (R?= 6.37 × 106 m; RMoon= 1.74 × 106 m; m? = 5.98 × 1024 kg; mMoon = 7.36 × 1022 kg.)
A. 6.03 × 10?3 min. B. 0.713 min. C. 84.3 min. D. 108 min. E. 140 min.
Weather occurs in the
a. stratosphere. b. troposphere. c. mesosphere. d. thermosphere.
Alfred Wegener postulated that the continents were once part of a single supercontinent that he called ______________
a. Pangaea b. Africasia c. Amerasia d. Atlantis
Suppose we take a disk of radius R and remove the material from r = R outward. Note that this decreases both the disk’s mass and its radius. Will the value of ? for the new object be larger, smaller, or the same as that for the original object?
A. The value of ? will be larger for the new object. B. The value of ? will be smaller for the new object. C. The value of ? is the same for both objects. D. We need to know the disk’s thickness to answer.