Based on the table, compare between metals, alloys, ceramics, and plastics in terms of weight, strength, stiffness, and thermal expansion.
What will be an ideal response?
Weight – for a given volume of material, the weight can be compared for different materials by examining the density. We see from Table 13.1 that plastics have the lowest, ceramics the next lowest, and then there’s a mixture of values pure metals and alloys. In general the highest density materials are pure metals, such as Tungsten and Lead.
Strength – based on the ultimate strength of the various materials in Table 13.1, we see that the pure metals have a range of values as compared with alloys, and alloys are much higher than plastics.
Stiffness – can be examined by looking at Young’s modulus for the different materials. Plastics have the lowest, ceramics next lowest, and then pure metals and alloys the highest.
Thermal Expansion – does not show the coefficient of thermal expansion (CTE), but high melting point materials generally have a lower thermal expansion. We can see from the table that alloys and some metals have pretty low melting points. Ceramics have fairly high melting points and are known for a low CTE. While values are not given for plastics, we would expect them to change the most with temperature.
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American capitalist businessmen usually justified their wealth on the basis of the "survival of the fittest." Yet in practice, most of them disliked business competition and sought to create effective monopolies. Why did they do so? Why did U.S. government efforts to curb these effective monopolies mostly fail?
What will be an ideal response?
Which of the following would utilize computer-controlled transportation systems?
a. Computer-assisted manufacturing b. Computer-aided design c. Computer-integrated manufacturing d. Computer-aided manufacturing e. Flexible manufacturing systems
Two technicians are discussing overhauling master brake cylinders. Technician A says that the manufacturer may recommend replacement of the entire master cylinder assembly instead of an overhaul. Technician B says that many overhaul kits include replacement piston assemblies. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
Conductors that become too hot ________
A) Could be the result of a short to ground before the load B) Create excessive resistance C) Both A and B D) Neither A nor B