Mercury pollution is widely recognized as a serious ecological problem. Much of the mercury released into the environment originates as a byproduct of coal burning and other industrial processes. It does not become dangerous until it falls into large bodies of water, where microorganisms convert it to methylmercury
Females |
|
AE | 52 |
EH | 69 |
LJ | 73 |
AN | 88 |
KR | 87 |
LU | 56 |
Want to see the full answer?
Check out a sample textbook solutionChapter 5 Solutions
An Introduction to Mathematical Statistics and Its Applications (6th Edition)
- According to Wikipedia, Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. The method was developed in the late 1940s at the University of Chicago by Willard Libby, who received the Nobel Prize in Chemistry for his work in 1960. It is based on the fact that carbon- 14 is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen. The resulting carbon-14 combines with atmospheric oxygen to form radioactive carbon dioxide, which is incorporated into plants by photosynthesis; animals then acquire carbon-14 by eating the plants. When the animal or plant dies, it stops exchanging carbon with its environment, and thereafter the amount of carbon-14 it contains begins to decrease as the carbon-14 undergoes radioactive decay. Measuring the amount of carbon-14 in a sample from a…arrow_forwardCotinine levels were measured in a group of smokers (n = 31, x = 172.48 ng/mL, s = 119.50 ng/mL) and a group of nonsmokers not exposed to tobacco smoke (n = 31, x = 16.35 ng/mL, s = 62.53 ng/mL). Cotinine is a metabolite of nicotine, meaning that when nicotine is absorbed by the body, cotinine is produced. Test the claim that the variation of cotinine in smokers is greater than the variation of cotinine in nonsmokers not exposed to tobacco smoke. Use a 0.01 significance level. What is the critical value? A. 1.84 B. 2.39 C. 1.74 D. 2.20 What is the test statistic and conclusion? A. 3.65; Reject Ho B. 3.65; Fail to reject Ho C. 3.07; Reject Ho D. 3.07; Fail to reject Ho Input answer as the LETTER ONLY.arrow_forwardO Filo | C/Users/LENOVO/Desktop/Jg120% Las206slulai/PDF/chapter5.pot ED Page view I A Read aiouo * Fighlight Draw Eras Tikrit University-Civil engineering Department Third Stage Eng. Anal.& Num. Meth. Dr.Adnan Jayed Zedan Example: find the particular solution of y" - 3y' + 2y = 12e-2t yO) = 2 & y'(0) = 6 %3Darrow_forward
- Consider the mixing process shown in the figure. A mixing chamber initially contains 4 liters of a clear liquid. Clear liquid flows into the chamber at a rate of 10 liters per minute. A dye solution having a concentration of 0.25 kilograms per liter is injected into the mixing chamber at a constant rate of liters per minute. When the mixing process is started, the well-stirred mixture is pumped from the chamber at a rate of 10 + r liters per minute. (a) Develop a mathematical model for the mixing process. Let Q represent the amount of dye in kilograms in the mixture. (dQ/dt)=? (b) The objective is to obtain a dye concentration in the outflow mixture of 0.1 kilograms per liter. What injection rate r is required to achieve this equilibrium solution? r = ? (c) Assume the mixing chamber contains 4 liters of clear liquid at time t. How many minutes will it take for the outflow concentration to rise to within 2% of the desired concentration of 0.1 kilograms per liter? t=?arrow_forwardA solution composed of 50% ethanol (EŁOH), 10% methanol (MEOH), and 40% water (H2O) is fed at the rate of 100 kg/hr into a separator that produces one stream at the rate of 60 kg/hr with the composition of 80% ELOH, 15% MEOH, and 5% H20, and a second stream of unknown composition. Calculate the composition (in %) of the three compounds in the unknown stream and its flowrate in kg/hr. Use matrix operations to solve the unknowns. Question 1 Set up the system of linear equations corresponding to material balance equation. Briefly describe.each generated equation.arrow_forwardThe Current (year 2020) population of the Earth is 7.5 billion people, and the yearly birthand death rates are β = 0.021 and δ = 0.009 respectively. Assuming the birth and deathrates remain constant, find the population of the Earth in the year 2120arrow_forward
- Does y =e9-x2-2 exist?arrow_forwardCalculate the solubility of MCl in water taking activity effects into account. As MCl dissolves, the ionic strength increases so there is a feedback effect: when MCl dissolves, it increases μ, which decreases activity coefficients, which allows more MCl to dissolve, which increases μ, which... You will have to solve this recursively. Repeat the cycle of calculations until you get two successive answers that agree to two significant figures. Use the value α = 250 pm for the M+ ion. Ksp= 5.9E-3arrow_forwardFind the general solution or particular solution of the DE.arrow_forward
- Calculus For The Life SciencesCalculusISBN:9780321964038Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.Publisher:Pearson Addison Wesley,Linear Algebra: A Modern IntroductionAlgebraISBN:9781285463247Author:David PoolePublisher:Cengage Learning