mags wants to know what is the hottest hairstyle trend is in her town. Which is the best group to survey A.Get a list of salons in her town and use a deck of cards to pick 5 of them to visit. Survey all hairstylists that work in each salon. B.Get a list of salons in her town and circle the 5 salons that are close to her house. Survey all the hairstylists that work at each salon C.Go to all the salons where Luna and her friends go. Survey all the hair stylists that work at each salon D. Ask her clients that are celebrities which salons they go to. Survey all the hair stylists that work at each salon

Answers 3

Answer: A

Step-by-step explanation:

The best group to survey is option A. A.Get a list of salons in her town and use a deck of cards to pick 5 of them to visit. Survey all hairstylists that work in each salon.

What is the survey?

Surveys represent the list of questions that should be focused on for extracting particular data from the people. It could be conducted via the phone, mail, internet, malls, etc.

Since mags want to know the hottest hairstyle trend so here he should get the list of towns and then use the deck of cards so that she should pick 5 for visiting them. Therefore, the correct option is a.

AI generated Answer

Answer: A. Get a list of salons in her town and use a deck of cards to pick 5 of them to visit. Survey all hairstylists that work in each salon. Explanation: The best group to survey in this situation is to get a list of salons in the town and randomly select 5 of them to visit. This will ensure that results are as unbiased as possible and give a better overall picture of the hairstyle trend in that particular area. By surveying all the hairstylists that work in each salon, this approach also gives a good variety of opinion regarding the local hairstyle trend.

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Hydroxyl radicals react with and eliminate many atmospheric pollutants. However, the hydroxyl radical does not clean up everything. For example, chlorofluorocarbons, which destroy stratospheric ozone, are not attacked by the hydroxyl radical. Consider the hypothetical reaction by which the hydroxyl radical might react with a chlorofluorocarbon: OH(g)+CF2Cl2(g)→HOF(g)+CFCl2(g) Use bond energies to explain why this reaction is improbable. Calculate ΔHrxn of this reaction.

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The enthalpy change ΔHrxn of the given reaction is 295 kJ/mol

Consider the hypothetical reaction whereby hydroxyl radical reacts with Chlorofluorocarbon. The balanced chemical equation can be expressed as:

\mathbf{OH_{(g)}+ CF_2Cl_{2(g)} \to HOF_{(g)} + CFCl_{2(g)} }

In the above chemical equation, the chemical species participating in the reaction are:

  • O-H, C-F, C-Cl, and O-F

The bond energies of these chemical species are:

  • O-H bond = 458.9 kJ/mol
  • C-F bond = 485 kJ/mol
  • C-Cl bond = 385 kJ/mol
  • O-F bond = 190 kJ/mol

The ΔHrxn is the enthalpy change of the reaction and it can be expressed by using the formula:

\mathbf{\Delta H_{rxn} = \sum \ B.E (reactants) - \sum \ B.E (products)}

∴

\mathbf{\Delta H_{rxn} =\Big ( B.E (O-H) + 2B.E(C-F) +2B.E(C-Cl) \Big) - \Big( B.E (O-H) + B.E(O-F) } \\ \\ \mathbf{\ \ \ \ \ \ \ \ \ \ \ \ \ \ +B.E( C-F )+2B.E(C-Cl) \Big)}

By replacing the bond energies into the above expression, we have:

\mathbf{\Delta H_{rxn} =\Big ( 458.9 \ kJ/mol + 2(485 \ kJ/mol) +2(385 \ kJ/mol) \Big)} \\ \\ \mathbf{ - \Big( 458.9 \ kJ/mol + 190 \ kJ/mol +485 \ kJ/mol +2(385 \ kJ/mol)\Big)}

\mathbf{\Delta H_{rxn} =\Big ( 2198.9 \ kJ/mol \Big) - \Big( 1903.9\ kJ/mol\Big)}}

\mathbf{\Delta H_{rxn} =295 \ kJ/mol}

Therefore, provided that the enthalpy change is positive, it implies that the reaction is improbable and non-favorable.

Which three-dimensional figure has the greatest number of faces? hexagonal prism octagonal pyramid rectangular prism pentagonal pyramid

Answer:

Octagonal pyramid

Step-by-step explanation:

Hexagonal Prism: 8 faces

2 hexagon bases, and 6 faces that connect each side of the bases

Octagonal pyramid: 9 faces

One octagon base, and 8 faces that meet at a point- all extending from each side of the base

Rectangular prism: 6 faces

Two rectangle bases, and 4 faces connecting each side of the bases

Pentagonal pyramid: 6 faces

One pentagon base, and 5 faces that meet at a point- all extending from each side of the base

I recommend searching for a picture of each of the figures to help you understand this.

Answer:

Octagonal pyramid

Step-by-step explanation:

RIGHT ON EDGE

Air at 27°C and a velocity of 5 m/s passes over the small region As (20 mm × 20 mm) on a large surface, which is maintained at Ts = 127°C. For these conditions, 0.5 W is removed from the surface As. To increase the heat removal rate, a stainless steel (AISI 304) pin fin of diameter 5 mm is affixed to As, which is assumed to remain at Ts = 127°C. (a) Determine the maximum possible heat removal rate through the fin. (Hint: look back to Chapter 3 to see which fin case produces the maximum heat transfer.) (b) What fin length would provide a close approximation to the heat rate found in part (a)? (Hint: refer to Example 3.9.) (c) Determine the fin effectiveness, εf. (d) What is the percentage increase in the heat rate from As due to installation of the fin? In other words, what is the percentage increase in q obtained by adding the fin as compared to not having the fin?

Answer:

a) The maximum possible heat removal rate = 2.20w

b) Fin length = 37.4 mm

c) Fin effectiveness = 89.6

d) Percentage increase = 435%

Explanation:

See the attached file for the explanation.

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EP Electric has identified two new methods to treat its cooling water. Alternative D(for inflow) would treat the raw water with a conventional reverse osmosis system so that the cycles of concentration could be increased from 5 to 20, This will result in water cost savings of $360,000 per year and chemical cost savings of $56,000 per year. The initial cost of the equipment will be $2.3 million with an operating cost of $125,000 per year Alternative B (for blowdown) will treat the cooling tower blowdown water using a highpressure seawater reverse osmosis system to recover most of the water that is sent to an evaporation pond. This option will result in water sav- ings of $270,000 per year. The cost of the system will be $1.2 million with an operating cost of $105,000 per year. Assuming one of the two methods must be installed, determine which is preferred on the basis of the incremental ROR value using MARRof 5%per year, which is a typically low return expected of government projects. Use a 10-year study period with no salvage value for either system. (Note: See Problem 8.41 for more on this situation.)

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