Various new quantities are introduced in this chapter, each having associated units. Which of the following quantities is followed by the wrong SI unit for that quantity?
1.resistivity, ?·m
2.temperature coefficient of resistivity, (°C)-1
3.electric power, kWh
4.drift speed, m/s
3
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Building codes usually limit the current carried by a No. 14 copper wire to 15 A. Many household circuits are wired with this size wire. What is the drift velocity of the electrons in this case?
The diameter of this wire is 1.6 mm. Assume one conduction electron per atom in copper. The atomic weight of copper is 63.3 g/mol and its density is 8900 kg/m3. Avogadro's number is 6.022 × 1023 molecules/mol and e = 1.60 × 10-19 C. A) 5.51 × 10-4 m/s B) 4.56 × 10-4 m/s C) 1.65 × 10-3 m/s D) 4.44 × 10-2 m/s E) 4.89 × 10-5 m/s
Uh-oh, the malicious eight-dimensional alien beings are back. This time, imagine that they suddenly changed nature so that neither the uncertainty principle nor the exclusion principle applied to electrons
What would happen almost immediately to atoms? A) Atoms would annihilate each other, releasing huge amounts of energy. B) Atoms would be immediately ionized. C) Nothing; atoms would be unaffected by this change. D) Electrons would fall into the nuclei of atoms.
A 2.3 cm tall statue is 15. cm in front of a convex mirror. The mirror radius of curvature is 18. cm
(a) Is the image real or virtual? (b) How far is the image from the mirror? (c) Is the image upright or inverted? (d) How high is the image?
The magnification for a flat mirror:
a. is a function of the image distance. b. is a function of the object distance. c. is a function of the object and image distances. d. is 1.