How will this affect its mechanical properties (strength, ductility)? Hint: think about how the motion of dislocations is blocked by grain boundaries.

How will this affect its mechanical properties (strength, ductility)? Hint: think about how the motion of dislocations is blocked by grain boundaries.

info@checkyourstudy.com Also, during recrystallization, the mechanical properties that were changed … Read More...
The British thermal unit (Btu) is commonly used in engineering applications. A Btu is defined as the amount of heat required to raise the temperature of 1 lb of water by 1 °F. There are __________ joules in one Btu. 1 lb = 453.59 g; °C = (5/9)(°F – 32 °); specific heat of H2O (l) = 4.184 J/g-K. A) 3415 B) 60.29 C) 1054 D) 3 5.120 10− × E) Additional information is needed to complete the calculation.

The British thermal unit (Btu) is commonly used in engineering applications. A Btu is defined as the amount of heat required to raise the temperature of 1 lb of water by 1 °F. There are __________ joules in one Btu. 1 lb = 453.59 g; °C = (5/9)(°F – 32 °); specific heat of H2O (l) = 4.184 J/g-K. A) 3415 B) 60.29 C) 1054 D) 3 5.120 10− × E) Additional information is needed to complete the calculation.

C) 1054
10) You would like to use the General Heat Conduction Equation to predict the temperature of the center of a chicken at any time while it is being cooked in an oven to know when it is finished. The oven has a constant air temperature and heat transfer coefficient. Simplify the appropriate form of the GHCE below as much as possible, and clearly state all required boundary/initial conditions, BUT DO NOT SOLVE. Assume all chicken properties are constant.

10) You would like to use the General Heat Conduction Equation to predict the temperature of the center of a chicken at any time while it is being cooked in an oven to know when it is finished. The oven has a constant air temperature and heat transfer coefficient. Simplify the appropriate form of the GHCE below as much as possible, and clearly state all required boundary/initial conditions, BUT DO NOT SOLVE. Assume all chicken properties are constant.

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Task 5 – Learning Outcomes 2.3 Determine heat transfer coefficient using experimental and tabulated data a. In an experimental result showed that air at 300 K and bulk velocity 10 m/s flows over a flat horizontal plate with a temperature of 1000 K at all points on its surface. Given that Nu=0.32Pr1/3 Re½ (Ta/Ts)0.117 Calculate the heat transfer rate from one side over the first 100 mm and the first 200 mm. Ta is the bulk air temperature and Ts is the surface temperature. Given that:

Task 5 – Learning Outcomes 2.3 Determine heat transfer coefficient using experimental and tabulated data a. In an experimental result showed that air at 300 K and bulk velocity 10 m/s flows over a flat horizontal plate with a temperature of 1000 K at all points on its surface. Given that Nu=0.32Pr1/3 Re½ (Ta/Ts)0.117 Calculate the heat transfer rate from one side over the first 100 mm and the first 200 mm. Ta is the bulk air temperature and Ts is the surface temperature. Given that:

Solution   a)   Nu=0.32Pr1/3 Re½ (Ta/Ts)0.117 Pr=0.69 Re1=10/.1*1.788*10e-5 Ta=1000, … Read More...
MSE201 Midterm Exam 10/17/2014 Each element 2 points. Put ALL calculations and answers in your Blue Book! 1. Materials are characterized by: a. Macroscopic properties b. Microstructure c. Atomic level composition d. All of the above 2. Atoms are: a. Discrete units of matter b. An abstract concept c. Found in fractional units d. Crystallographic lattice points 3. The Burger’s vector describes: a. Surface cracks b. Crystal twinning c. Dislocation geometry d. The most direct route to McDonald’s 4. Cubic Close Packed (CCP) is another name for which of the following: a. HCP b. BCC c. FCC d. All of the above 5. Glass and ceramic materials tend to: a. Fail catastrophically at low strain b. Show ductility c. Deform plastically before failure d. Have elastic moduli ~106 Pa 6. Solid state diffusion & vacancy generation: a. Are completely unrelated b. Are directly related c. Increase linearly with Temperature d. Describe lattice point motion 7. Diffusion & heat transfer: a. Are completely unrelated b. Are directly related c. Increase linearly with Temperature d. Have identical differential equations 8. A vacancy and a dislocation both: a. Disrupt the crystal lattice b. Represent partial occupancy c. Contain ruptured bonds d. Are low energy regions 9. Dislocations: a. Are interstitial dopants b. Are crystal defects c. Require atomic impurities d. Enhance plastic deformation 10. Ionic, covalent and metallic bonding are primary bonding types. a. Primary bonds require exchange or sharing of what between atoms? b. How does electronegativity drive the reaction of sodium metal and chlorine gas to form sodium chloride? c. Carbon-carbon bonds are what type? d. The directional nature of covalent bonds is related to what structural feature of atoms? 11. The (111) plane of the FCC structure is close-packed. a. Sketch this plane within a unit cell. b. How many atoms are on the plane you drew inside the unit cell? c. Estimate the area of the plane d. Calculate the area atomic density e. If there is one vacancy per 1012 lattice points at 273K, what is the partial atomic occupancy of each lattice point? f. If you are asked calculate the number of vacancies present at 600K, what additional information do you need? 12. Dislocation motion occurs largely along close-packed directions and planes. First, compare the FCC & BCC structures: a. Describe any close packed planes b. Describe any close packed directions c. If the ductile-to-brittle transition at low temperatures is related to the number of close-packed directions and planes, do you expect BCC or FCC metals to have greater ductility? d. Magnesium and other HCP metals are brittle. Does your analysis from 12.c. support this observation? 13. A tensile test is performed on a ductile sample. The first 1% of strain is elastic with a modulus of 100E9 Pa, at which point plastic deformation begins. The tensile strength of 1.1E9 Pa is determined at 9% strain, while failure occurs at a stress of 9E8 Pa and strain of 18%. a. Sketch the complete stress-strain cycle b. Estimate the toughness in units of J/m3.

MSE201 Midterm Exam 10/17/2014 Each element 2 points. Put ALL calculations and answers in your Blue Book! 1. Materials are characterized by: a. Macroscopic properties b. Microstructure c. Atomic level composition d. All of the above 2. Atoms are: a. Discrete units of matter b. An abstract concept c. Found in fractional units d. Crystallographic lattice points 3. The Burger’s vector describes: a. Surface cracks b. Crystal twinning c. Dislocation geometry d. The most direct route to McDonald’s 4. Cubic Close Packed (CCP) is another name for which of the following: a. HCP b. BCC c. FCC d. All of the above 5. Glass and ceramic materials tend to: a. Fail catastrophically at low strain b. Show ductility c. Deform plastically before failure d. Have elastic moduli ~106 Pa 6. Solid state diffusion & vacancy generation: a. Are completely unrelated b. Are directly related c. Increase linearly with Temperature d. Describe lattice point motion 7. Diffusion & heat transfer: a. Are completely unrelated b. Are directly related c. Increase linearly with Temperature d. Have identical differential equations 8. A vacancy and a dislocation both: a. Disrupt the crystal lattice b. Represent partial occupancy c. Contain ruptured bonds d. Are low energy regions 9. Dislocations: a. Are interstitial dopants b. Are crystal defects c. Require atomic impurities d. Enhance plastic deformation 10. Ionic, covalent and metallic bonding are primary bonding types. a. Primary bonds require exchange or sharing of what between atoms? b. How does electronegativity drive the reaction of sodium metal and chlorine gas to form sodium chloride? c. Carbon-carbon bonds are what type? d. The directional nature of covalent bonds is related to what structural feature of atoms? 11. The (111) plane of the FCC structure is close-packed. a. Sketch this plane within a unit cell. b. How many atoms are on the plane you drew inside the unit cell? c. Estimate the area of the plane d. Calculate the area atomic density e. If there is one vacancy per 1012 lattice points at 273K, what is the partial atomic occupancy of each lattice point? f. If you are asked calculate the number of vacancies present at 600K, what additional information do you need? 12. Dislocation motion occurs largely along close-packed directions and planes. First, compare the FCC & BCC structures: a. Describe any close packed planes b. Describe any close packed directions c. If the ductile-to-brittle transition at low temperatures is related to the number of close-packed directions and planes, do you expect BCC or FCC metals to have greater ductility? d. Magnesium and other HCP metals are brittle. Does your analysis from 12.c. support this observation? 13. A tensile test is performed on a ductile sample. The first 1% of strain is elastic with a modulus of 100E9 Pa, at which point plastic deformation begins. The tensile strength of 1.1E9 Pa is determined at 9% strain, while failure occurs at a stress of 9E8 Pa and strain of 18%. a. Sketch the complete stress-strain cycle b. Estimate the toughness in units of J/m3.

info@checkyourstudy.com MSE201 Midterm Exam 10/17/2014 Each element 2 points. Put … Read More...
When discussing homeostasis in body temperature, it is NOT true to state that the body responds to Select one: a. heat by stimulating sweat release. b. heat by constricting the blood vessels in the skin. c. cold by contracting the arrector pili muscles. d. cold by contracting skeletal muscles causing shivering. e. cold by rerouting blood away from the skin.

When discussing homeostasis in body temperature, it is NOT true to state that the body responds to Select one: a. heat by stimulating sweat release. b. heat by constricting the blood vessels in the skin. c. cold by contracting the arrector pili muscles. d. cold by contracting skeletal muscles causing shivering. e. cold by rerouting blood away from the skin.

Info@checkyourstudy.com                                                                                                                                                                                       : heat by constricting the blood vessels in the … Read More...