Problem 14.71 IP Standing Waves in the Human Ear The human ear canal is much like an organ pipe that is closed at one end (at the tympanic membrane or eardrum) and open at the other (Figure 1) . A typical ear canal has a length of about 2.4 cm.

Part A What are the fundamental frequency and wavelength of the ear canal? Express your answer using two significant figures. f1 =_______ Hz

Part B Express your answer using two significant figures. λ1 = _____cm

Part C Find the frequency and wavelength of the ear canal's third harmonic. (Recall that the third harmonic in this case is the standing wave with the second-lowest frequency.) Express your answer using two significant figures. f3 =_______ Hz

Part D Express your answer using two significant figures. λ3 =_____ cm

Part E Suppose a person has an ear canal that is shorter than 2.4 cm. Is the fundamental frequency of that person's ear canal greater than, less than, or the same as the value found in part A? Explain.

In a survey of

809

human resource professionals concerning challenges they faced in the​ workplace,

328

said that employee​ retention/turnover was an important challenge and

191

said that employee satisfaction was an important challenge. Complete parts​ (a) through​ (c) below.

a. Construct a​ 95% confidence interval estimate of the population proportion of human resource professionals who believe that employee​ retention/turnover was an important challenge.

The​ 95% confidence interval estimate for the population proportion is

b. Construct a​ 95% confidence interval estimate of the population proportion of human resource professionals who believe that employee satisfaction was an important challenge.

The​ 95% confidence interval estimate for the population proportion is

An article included data from a survey of 2,595 hiring managers and human resource professionals. The article noted that more employers are now using social networks to screen job applicants. Of the 2,595 people who participated in the survey, 1,200 indicated that they use social networking sites such as Facebook, MySpace, and LinkedIn to research job applicants. Assume that the sample is representative of hiring managers and human resource professionals.

Use the five-step process for estimation problems (EMC³) to construct a 95% confidence interval for the proportion of hiring managers and human resource professionals who use social networking sites to research job applicants.

Cohleland, a developing country, has a government that wants to encourage the country’s growth.

In each scenario, what policy would you recommend the government of Cohleland to enact in order to increase growth?

The country has an abundance of capital and labor with low levels of human capital and technology.The country has low levels of capital, human capital, and technology; however, there is plenty of labor.

The country has an abundance of capital and labor with low levels of human capital and technology. Also, Zackburgh, a rich city-state near Cohleland has been offering fast track citizenships to any person from Cohleland who has earned a college degree.  

4. Many private security companies perform tasks similar to public law enforcement. Because of this, many security companies’ human resources departments seek applicants with similar backgrounds and experience that public law enforcement also desires. In a 500-word response, identify the skills and experience human resource managers in private security would seek in their applicants. Provide and explain two qualities of private security that would make the job more attractive to applicants than the public law enforcement. Provide and explain to issues or challenges human resource managers might face in applicants selecting private security over public law enforcement.

8) Which of the following reactions with covalently closed, circular double stranded DNA (ccc dsDNA) does NOT result in a new linking number? Select one choice from the list below (A-D) and explain your answer.

A. incubation with a type I topoisomerase

B. incubation with a type II topoisomerase

C. incubation with ethidium bromide

D. a brief incubation with DNase I followed by resealing the breaks in the phosphodiester backbone with another enzyme (DNA ligase)

Q2. An enzyme has a K_m of 2.8 * 10^-5 M and a V_max of 53 μM/s.

(i) Calculate V_o if [S] = 3.7 * 10^-4 M and [I] = 4.8 *10^-4 M for (a) a competitive inhibitor, (b) a noncompetitive inhibitor and (c) an uncompetitive inhibitor. (Assume K_i = 1.7 * 10^-5 M.)

(ii) The degree of inhibition is given by i (%) = 100(1 - V_i/V_o). Calculate the percent inhibition in each of the three cases above.

An uncatalyzed reaction has a rate of 4.4 x 10-7 s–1 at room temperature (25 °C). When an enzyme is added the rate is 3.3 x 104 s–1. If the height of the activation barrier for the uncatalyzed rate is 28 kcal/mol, what is the height of the activation barrier for the catalyzed rate? Report your answer in terms of kcal/mol to the nearest tenths. Also, assume the pre-exponential terms for the uncatalyzed and catalyzed reactions are the same.

3. Cellular transport of proteins is very important in order for a cell to function properly. For each of the mutations below, (1) explain what type of transport will be affected by explaining the correct transport process and where the problem will arise and (2) where the proteins that are transported incorrectly will be found (6 pts). (1) A mutation in N-acetyl transferase, the enzyme that adds N-linked glycosylation to proteins. (2) A mutation in the TOM complex (3) A mutation that causes GTP to not be hydrolyzed in the cytosol