The correct answer is D. Justin avoids eye contact with the board so that they don't feel intimidated. He also doesn't want to take away from the neighborhood's statement so he doesn't mention his relationship with real estate investors.
Explanation:
In this situation, Justin needs to communicate his interest in the neighborhood while showing he is an authority in this area by explaining his experience in this field and demonstrating he knows about the topic. In this context, it is ineffective to avoid eye contact because this might be interpreted as a lack of confidence or knowledge. Also, if he does not mention his experience or relationship with real estate investors the audience will not know he is an authority in the field and his ideas are credible. Thus, option D is ineffective for showing credibility and authority.
Answer:
Explanation: All real solids are impure. A very high purity material, say 99.9999% pure. Impurities are often added to materials to improve the properties. For instance, carbon added in small amounts to iron makes steel, which is stronger than iron. Boron impurities added to silicon drastically change its electrical properties.
The properties of materials are profoundly influenced by the presence of imperfections.
TYPES OF IMPURITIES
1. Point defects
• Vacancy atoms (vacant atomic sites in a structure causing a distortion of planes). They are common, especially at high temperatures when atoms are frequently and randomly change their positions leaving behind empty lattice sites. In most cases diffusion (mass transport by atomic motion) can only occur because of vacancies.
• Self-Interstitial atoms ("extra" atoms positioned between atomic sites causing a distortion of planes) A self interstitial atom is an extra atom that has crowded its way into an interstitial void in the crystal structure. Self interstitial atoms occur only in low concentrations in metals because they distort and highly stress the tightly packed lattice structure.
2. Impurities:
- Substitutional (mpurity atom in lattice). Substitutional impurity atoms are usually close in size (within approximately 15%) to the bulk atom. An example of substitutional impurity atoms is the zinc atoms in brass. In brass, zinc atoms with a radius of 0.133 nm have replaced some of the copper atoms, which have a radius of 0.128 nm.
- Interstitial atoms (impurity atom not in regular lattice sit) . An example of interstitial impurity atoms is the carbon atoms that are added to iron to make steel. Carbon atoms, with a radius of 0.071 nm, fit nicely in the open spaces between the larger (0.124 nm) iron atoms.
3.
Line defects
• Dislocations
4. Area defects
• Grain Boundaries
Explanation:
1. Circumference of the handle (where the effort is applied) is pi times diameter.
C = πd
C = 1.5π inches
C ≈ 4.71 inches
2. Mechanical advantage is the ratio of distance in over distance out.
MA = din / dout
MA = 1.5 / 0.25
MA = 6
3. Mechanical advantage is the ratio of force out over force in.
MA = Fout / Fin
6 = Fout / 10 lb
Fout = 60 lb
Answer:
Magnets do not have energy
Explanation:
They can only control it.
Brainlist so I can rank up please.
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