The natural circulation of water—from ocean to air to ground to ocean and then back to the atmosphere—is called the
A) circle of life.
B) hydrologic cycle.
C) carbon cycle.
D) rock cycle.
Answer: B
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In powder fabrication of metals and ceramics, when the pressed powder part is sintered, the powder particles bond to each other, and voids are reduced by the ___________of atoms.
Fill in the blank(s) with the appropriate word(s).
For each of the original chemical compositions and temperatures at 1 atmosphere of pressure for the aluminum (Al)-nickel (Ni) alloys (see Figure 5.15) listed below, give the following:
1. The phases present.
2. From the Gibbs phase rule, determine the degrees of freedom in the material. Can the composition of the phases or phases present be adjusted by changing the original chemical composition?
3. The chemical composition of each phase.
4. The atom fraction of each phase.
Protostars start off more luminous than the main sequence stars they become
Indicate whether the statement is true or false
A tuning fork is sounded above an adjustable length resonating tube (one end closed), which resonates at a length of 0.250 m and again at 0.750 m. If the tube length were extended further, at what point will the tuning fork again create a resonance condition?
a. 1.75 m c. 1.25 m b. 1.50 m d. 1.00 m