The Science and Engineering of Materials (MindTap Course List)
7th Edition
ISBN: 9781305076761
Author: Donald R. Askeland, Wendelin J. Wright
Publisher: Cengage Learning
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Chapter 1, Problem 1.18P
To determine
The difference between amorphous and crystalline materials and daily life example.
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Question 1:
The density and associated percent crystallinity for two polypropylene materials are as follows:
Crystallinity (%)
62.8
54.4
p (g/cm³)
0.904
0.895
(a) Compute the densities of totally crystalline and totally amorphous polypropylene.
(b) Determine the density of a specimen having 74.6% crystallinity.
(c) Determine the percent crystallinity of a specimen having a density of 1.382 g/cm³
EGMN 202 Deformables, question is attached.
You are given the density of a metal as 2.07 g/cm³. You are advised the crystallographic structure is fcc, and the atomic mass is 25.5
g/mol. What is the atomic radius of the metal?
a. 0.15 nm
b. 0.12 nm
c. 0.11 nm
d. 0.18 nm
Chapter 1 Solutions
The Science and Engineering of Materials (MindTap Course List)
Ch. 1 - Define materials science and engineering (MSE).Ch. 1 - What is the importance of the engineering...Ch. 1 - Define the following terms: Composition;...Ch. 1 - Explain the difference between the terms materials...Ch. 1 - The myriad materials in the world primarily fall...Ch. 1 - What are some of the materials and mechanical...Ch. 1 - What is a ceramic, and what are some of the...Ch. 1 - comparisons between thermoplastics and...Ch. 1 - Give three examples of composites that can be...Ch. 1 - For each of the followign classes of materials,...
Ch. 1 - Describe the enabling materials property of each...Ch. 1 - Describe the enabling materials property of each...Ch. 1 - Prob. 1.13PCh. 1 - Prob. 1.14PCh. 1 - Prob. 1.15PCh. 1 - Temperature indicators are sometimes produced from...Ch. 1 - Prob. 1.17PCh. 1 - Prob. 1.18PCh. 1 - Prob. 1.19PCh. 1 - Prob. 1.20PCh. 1 - Steel is often coated with a thin layer of zinc if...Ch. 1 - Prob. 1.22PCh. 1 - Prob. 1.23PCh. 1 - Prob. 1.24PCh. 1 - You are an engineer working for a manufacturer of...Ch. 1 - We would like to produce a transparent canopy for...Ch. 1 - Prob. 1.27PCh. 1 - Prob. 1.28PCh. 1 - Prob. 1.29PCh. 1 - Prob. 1.30PCh. 1 - Prob. 1.31PCh. 1 - You would like to be able to identify different...Ch. 1 - You would like to be able to physically separate...Ch. 1 - Some pistons for automobile engines might be...Ch. 1 - • Convert 7750kg/m3tolb/ft3 using the Unit...Ch. 1 - • Using the basic search option in Knovel, find as...Ch. 1 - Prob. 1.3KP
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- The strength of steel is given as 225MPa. That of a ceramic is indicated as 200-800MPa . Explain the difference in notationarrow_forward1. Titanium has an atomic radius of 147 pm, an atomic weight of 47.867 g/mol, and an HCP crystal structure. Compute for its true density.arrow_forwardConsider a defect in a crystalline lattice as shown below. Which of the following statements is true? B Select one: O a. The region around B experiences a higher strain on the upper side compared to the lower side O b. The region around B experiences mainly shear strain O c. The region around B experiences mainly compressive strain O d. The region around B is unaffected by the impurityarrow_forward
- Q1/A Prove that the volume of an FCC unit cell, Vc is; Vc = 16R³√2 B) Explain in general terms, why many polymers and some ceramic glasses have an amorphous or semicrystalline structure.arrow_forwardDescribe with the aid of suitable diagram and show how the piezoelectric property of a quartz crystal material is exploited in measurement of pressurearrow_forwardIron has a BCC crystal structure, an atomic radius of 0.124 nm, and an atomic weight of 55.85 g/mol. Compute its theoretical density and compare with its experimental density, which is 7.87 g/cm3. Which one is higher? O Experimental density is higher. O Not enough information to compute the theoretical density. O Theoretical density is higher. O Neither. Both are equal.arrow_forward
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