You are asked to produce a part that will be shaped by forging from a thick block of metal. Forging is a form of controlled hammering the part into shape that is covered in Section 13.2.1. The final part will have some thin sections that will experience extensive deformation and some thick sections that will experience minimal deformation. It is desired that the mechanical properties of the as forged metal be relatively uniform throughout the part. It is planned to use the part in the as forged condition without subsequent treatment. What defect property of metals may be important in the metal selection, and why is this property important for this design?
What will be an ideal response?
Select a material with a low stacking fault energy that does not harden with deformation.
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How many powers of ten separate the approximate diameter of Earth (North and Central America) from the diameter of our Solar System (the orbits of Neptune and Pluto)?
A: 4. B: 2. C: 6. D: 16. E: 9.
The lithosphere of a planet is the layer that consists of
A) material above the crust. B) material between the crust and the mantle. C) the rigid rocky material of the crust and uppermost portion of the mantle. D) the softer rocky material of the mantle. E) the lava that comes out of volcanoes.
An ideal monatomic gas undergoes a reversible expansion to 1.5 times its original volume. In which of these processes does the gas perform the least amount of work?
A) at constant pressure B) if the pressure increases in proportion to the volume C) if the pressure decreases in proportion to the volume D) at constant temperature E) adiabatically
The Garfield Thomas water tunnel at Pennsylvania State University has a circular cross-section that constricts from a diameter of 3.6 m to the test section, which is 1.2 m in diameter. If the speed of flow is 2.0 m/s in the large-diameter pipe, determine the speed of flow in the test section
a. 9.0 m/s c. 27 m/s b. 18 m/s d. 1.0 m/s