The magnetic field lines about a current-carrying wire form _______.
A. eddy currents
B. circles
C. spirals
D. radial lines
Answer: B. circles
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An object drops a distance h in a time of 6.3 s on the surface of the earth (neglecting air effects)
How long would it take the same object to drop the same distance on the surface of spherical asteroid X having a mass of 1.1 × 1022 kg and a radius of 4.0 × 105 m? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m) A) 9.2 s B) 6.3 s C) 5.2 s D) 12 s E) 3.3 s
Two large closely-spaced parallel metal plates are uniformly and oppositely charged and the electric field between them is 7.6 × 106 N/C
(a) What is the charge per unit area on each plate? (b) If the plates are now moved two times farther apart, what is the electric field between the plates?
Fiber optics has to do with:
a. the color of fabrics. b. light having fiber characteristics as well as wave and particle characteristics. c. string theory. d. none of the above.
The compound 6-aminohexanoic acid is used to make the condensation polymer nylon-6. Polymerization is not always successful, however, because of a competing side reaction. What is this side reaction?
A) One 6-aminohexanoic acid reacts with another and this reaction is favored in dilute solutions. B) One 6-aminohexanoic acid reacts with another and this reaction is favored in concentrated solutions. C) One end of the 6-aminohexanoic acid reacts with the other and this reaction is favored in dilute solutions. D) One end of the 6-aminohexanoic acid reacts with the other and this reaction is favored in concentrated solutions.