7. Which of the following is false: a. The coefficient of thermal expansion is larger if the bond energy is smaller b. Ceramics are generally ionic bonding c. Van der Waals bonding is generally stronger than covalent bonding d. The free electrons in metallic bonding is reason for electrical conductivity 8. Which of the following is true: a. Polymers are generally denser than ceramices b. Young's modulus of ceramics are similar to polymers c. Composites have higher tensile strength than metals d. Ceramics have low resistance to fracture than metals

7. Which of the following is false: a. The coefficient of thermal expansion is larger if the bond energy is smaller b. Ceramics are generally ionic bonding c. Van der Waals bonding is generally stronger than covalent bonding d. The free electrons in metallic bonding is reason for electrical conductivity 8. Which of the following is true: a. Polymers are generally denser than ceramices b. Young's modulus of ceramics are similar to polymers c. Composites have higher tensile strength than metals d. Ceramics have low resistance to fracture than metals

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Related questions

Q: Determine the following 1. Determine what substance has a great strength? Calculate and…

A: Given: To find: 1. Determine what substance has a great strength? Calculate and demonstrate. 2.…

Q: wo carbon plates are bonded to the upper and lower surfaces of a wooden beam. The beam is simply…

A: The length of beam, L = 900 m = 0.9 mThe width of beam cross-section, b = 20.5 mm = 0.0205 mmThe…

Q: 9. A polymer sample with an original length of 10 cm and cross- sectional area of 1 cm² is subjected…

Q: When a viscoelastic material is loaded and unloaded, the unloading curve is different to the loading…

A: The stress-strain curve of a viscoelastic material exhibits hysteresis, with the area of the loop…

Q: The elastic limit of an alloy is 6.0 x 10% N/m?. What is the minimum radius rmin of a 9.0 m long…

Q: A rectangular polypropylene [E = 6,200 MPa] bar (1) is connected to a rectangular nylon [E = 1,400…

Q: A load of 500 N is applied on a cylindrical wire of 3.0 mm diameter and 2.5 x 10* mm length. The…

A: Solution: Given Data: P = 500 N d = 3 mm L = 25000 mm E = 107 GPa To Find: Elongation in the…

Q: 3. A structural component is made from a steel alloy with a plain strain fracture toughness of 77.0…

A: Given:Plain strain fracture toughness, Yield strength, Design stress, Geometric factor, The flaw…

Q: metal wires silicon frame cantilever doped piezoresiston silicon frame A fixed-free cantilever is…

A: Given data for cantilever,

Q: Fin Comparisons You are designing a part that is to have truncated triangular fins, a diagram of…

Q: A polymer has creep behaviour that can be represented as a power law equation: E = 0 (Jo + Jit")…

A: Stress is characterized as power per unit region inside materials that emerge from remotely applied…

Q: Which of the following statements is incorrect regarding the mechanical characteristics of polymers?…

A: Polymers: The polymers are made of long and repeating chains of the molecules. They have different…

Q: Which of the following can be characterized with yield stress? Thixotropy Plastic…

A: Four types of fluid are given for which we have to select the option which has yield stress.

Q: Polymers C and D have the same chemical composition, but Polymer C has a 40% greater weight- average…

A: Given data: (Mω__)C is the weight average molecular weight of the polymer C.(Mω__)D is the weight…

Q: Sintered silicon nitride parts are expected to experience tensile stresses 50% of the ultimate…

A: Given data:- tensile stresses (σ) =50% of the ultimate tensile strength Specific surface energy (γ)=…

Q: To make a secure fit, rivets that are larger than the rivet hole are often used and the rivet is…

A: given data; steel rivet diameter(D1)=1.871cm hole diameter(D2)=1.869cm initial temperater(T1)=200…

Q: A sample of crosslinked polvisoprene rubber undergoes a constant strain rate axial tension…

A: Given: Original length = 3.6 cm Area = 0.2 x 0.1 = 0.02 cm2 = To find: Stress strain curve…

Q: problem 3.12: What is the Value of the member BD? O 674 O 1433 # B COL O 2483 # O935 # D 10' 10 A…

Q: Figure 12.58 shows a person pulling down on a rope with a 50 N modulus force. The forearm is pointed…

A: The angle of inclination of arm is θ=30°. The total length of the arm is L=30 cm. The distance of…

Q: An aluminum [E = 10,000 ksi] control rod with a circular cross section must not stretch more than…

Concept explainers

Terminology in Metal Alloys

Metal is the pure chemical element you would find on the periodic table. 91 of the 118 elements on the periodic table are metals – which make them some of the most plentiful elements in the world.

Question

7. Which of the following is false:
a. The coefficient of thermal expansion is larger if the bond energy is smaller
b. Ceramics are generally ionic bonding
c. Van der Waals bonding is generally stronger than covalent bonding
d. The free electrons in metallic bonding is reason for electrical conductivity
8. Which of the following is true:
a. Polymers are generally denser than ceranmics
b. Young's modulus of ceramics are similar to polymers
c. Composites have higher tensile strength than metals
d. Ceramics have low resistance to fracture than metals

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

A high-density polyethelene (HDPE) [E = 780 MPa; ν = 0.46] rod has a diameter of 100 mm before load P is applied. In order to maintain certain clearances, the diameter of the rod must not exceed 101 mm when loaded. What is the largest permissible compressive load P that can be applied to the HDPE rod?
Elastic Properties of Materials 4. A cylindrical bar of steel 10 mm (0.4 in.) in diameter is to be deformed elastically by application of a force along the bar axis. Using the data in Table given below, determine the force that will produce an elastic reduction of 3 × 10¯³mm (1.2 × 10-4 in.) in the diameter. Metal Alloy Aluminum Brass Copper Magnesium Nickel Steel Titanium Tungsten Modulus of Elasticity GPa 69 97 110 45 207 207 107 407 106 psi 10 14 16 6.5 30 30 15.5 59 Shear Modulus GPa 25 37 46 17 76 83 45 160 106 psi 3.6 5.4 6.7 2.5 11.0 12.0 6.5 23.2 Poisson's Ratio 0.33 0.34 0.34 0.29 0.31 0.30 0.34 0.28
Which of the statements below are accurate regarding the stress-strain behavior of polymers: (This question has more than one correct answer) а. Strain softening happens in elastomers where the deformation gradually leads to a decrease in stress under constant strain rate b. As temperature is reduced, the necking behavior of plastic tensile bars completely disappears С. The slope of the stress-strain curve for totally elastic and brittle polymers is always positive d. The stress-strain curve for vulcanized elastomers has a greater slope than unvulcanized polymers throughout
Q1. A bimetallic strip is used in temperature control systems as a safety component for automatic shutdown. You get two metal (Invar and yellow brass) with a length of 3.5 cm and thickness of 0.25 mm to construct the bimetallic strip. The system should work at the temperatures between -20 and 130 °C. Calculate the radius of curvature at the extremes of the design temperature range if two metals are bonded at 30•C.
#5
Can you represent strain as a function of time using the Maxwell Viscoelastic Model.
1. For the stress-strain curve shown below, please estimate the properties indicated. (a) Fracture Strain Please do your work on a separate sheet of paper, and put your answers in the boxes on the right. Be sure to include the proper symbol and units. Stress Strain 70 60 50 Stress (ksi) 240 30 20 10 70 0 0.000 60 50 Stress (ksi) 40 20 10 KULL 0 0.000 0.010 0.050 0.100 Strain (in/in) Stress Strain 0.020 0.030 Strain (in/in) 0.040 0.150 0.050 (b) Ultimate Tensile Stress (c) Fracture Stress (d) Proportional Limit (e) Elastic Modulus (1) Yield Stress (g) Tensile Toughness (Modulus of Toughness) (h) Modulus of Resilience
Q1: You are designing a high-pressure oxygen cylinder for hospitals fighting against COVID. The material used is layered unidirectional continuous fiber reinforced composite, as schematically shown in Fig.1 (a). In the 0° layer, the fiber is along the Y direction, and the fiber is along X direction in the 90° layer. The thickness of the 90° layer is 1.5 times of that of the 0° layer. The matrix material is an isotropic material with the Young's modulus E-10 GPa and volume fraction Vm-20%, while the continuous fiber is an anisotropic material with the Young's modulus E₁-250 GPa along the length direction, E2-20 GPa along the transverse direction and volume fraction V₁-80% a) Based on rule of mixture and mechanics of material method, calculate the effective Young's modulus along each direction (Ex, Ey, E₂). b) The as-produced (unloaded) inner radius Ro-0.1 m, the wall thickness H=0.005 m (<
Q2: A fiberglass composite consists of a matrix of vinyl ester and reinforcing fibers of E-glass. The volume fraction of E-glass is 30%. The density of the vinyl estiser 0.882 g/cm³, and its modulus of elasticity is 3.6 GPa. The density of E-glass is 2.6 g/cm³, and its modulus of elasticity is 76 GPa. A section of composite 1 cm by 25 cm by 2 m is fabricated with the E-glass fibers running longitudinally in the 2000 mm direction. Determine: (a) The masses of vinyl ester and E-glass fibers. (b) The density of the composite. (c) The composite modulus of elasticity in the longitudinal and the perpendicular directions of the glass fibers. (d) If the tensile strength of the glass fibers, is 1 GPA and the tensile strength of the epoxy matrix is 60 MPa, find the tensile strength of the composite in the longitudinal direction.
The Poisson’s ratio, μ of common engineering materials lies in the range: 0 1.2 0 0.5 -1 1 - 0.5 0.5
A composite material consists of 60% glass fibre by volume (V₁ = 0.6). Half of the fibre is in unidirectional (0°) roving form and the other half is continuous fibre (0°, 90°) mat. The matrix is polyester. The properties of the constituent materials are shown in Table 4. Table 4 Density (Mg.m³) Tensile modulus (GPa) Tensile strength (MPa) Fibre 2.6 69 1200 i. Calculate the density of the composite material Matrix 1.1 2 35 ii. Calculate the tensile strength, oc, and the tensile modulus, Ec, of the composite in the 0° and 90° directions using the simple "rule of mixtures" approach.
Question 2 Figure 2 shows the dependence of fatigue strength on testing cycles (S-N curve) of an acetal polymer. 60 50 40 30 20 10 104 105 106 107 108 Number of cycles to failure Figure 2 The S-N fatigue curve for an acetal polymer a. What is the fatigue strength, or maximum stress amplitude, at one million cycles of loading? b. An acetal polymer 30-cm-long bar with a diameter of 20 mm is designed to survive one million cycles of loading, what is the maximum allowable axial load that can be applied on one end of the bar? Magnitude of stress Reversal, MPa