Calculus & Its Applications (14th Edition)
14th Edition
ISBN: 9780134437774
Author: Larry J. Goldstein, David C. Lay, David I. Schneider, Nakhle H. Asmar
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 14RE
Radioactive Decay You have
a. How much will remain after
b. When will
c. What is the half-life of this radioactive material?
d. At what rate will the radioactive material be disintegrating after
e. After how many years will the radioactive material be disintegrating at the rate of about
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Chapter 5 Solutions
Calculus & Its Applications (14th Edition)
Ch. 5.1 - a. Solve the differential equation...Ch. 5.1 - Under ideal conditions a colony of Escherichia...Ch. 5.1 - In Exercises 110, determine the growth constant k,...Ch. 5.1 - In Exercises 110, determine the growth constant k,...Ch. 5.1 - In Exercises 110, determine the growth constant k,...Ch. 5.1 - In Exercises 110, determine the growth constant k,...Ch. 5.1 - In Exercises 110, determine the growth constant k,...Ch. 5.1 - In Exercises 110, determine the growth constant k,...Ch. 5.1 - In Exercises 110, determine the growth constant k,...Ch. 5.1 - In Exercises 110, determine the growth constant k,...
Ch. 5.1 - In Exercises 110, determine the growth constant k,...Ch. 5.1 - In Exercises 110, determine the growth constant k,...Ch. 5.1 - In Exercises 1118, solve the given differential...Ch. 5.1 - In Exercises 1118, solve the given differential...Ch. 5.1 - In Exercises 1118, solve the given differential...Ch. 5.1 - In Exercises 1118, solve the given differential...Ch. 5.1 - In Exercises 1118, solve the given differential...Ch. 5.1 - In Exercises 1118, solve the given differential...Ch. 5.1 - In Exercises 1118, solve the given differential...Ch. 5.1 - In Exercises 1118, solve the given differential...Ch. 5.1 - Population and Exponential Growth Let P(t) be the...Ch. 5.1 - Growth of a Colony of Fruit Flies A colony of...Ch. 5.1 - GrowthConstant for a Bacteria Culture Abacteria...Ch. 5.1 - Growth of a Bacteria Culture The initial size of a...Ch. 5.1 - Using the Differential Equation Let P(t) be the...Ch. 5.1 - Growth of Bacteria Approximately 10,000 bacteria...Ch. 5.1 - Growth of cells After t hours, there are P(t)...Ch. 5.1 - Insect Population The size of a certain insect...Ch. 5.1 - Population Growth Determine the growth constant of...Ch. 5.1 - Time to Triple Determine the growth constant of a...Ch. 5.1 - Exponential Growth A population is growing...Ch. 5.1 - Time to DoubleA population is growing...Ch. 5.1 - Exponential Growth The rate of growth of a certain...Ch. 5.1 - Worlds Population The worlds population was 5.51...Ch. 5.1 - Prob. 33ECh. 5.1 - A Population Model The population (in millions) of...Ch. 5.1 - Radioactive Decay A sample of 8 grams of...Ch. 5.1 - Radioactive Decay Radium 226 is used in cancer...Ch. 5.1 - Decay of Penicillin in the Bloodstream A person is...Ch. 5.1 - Radioactive Decay Ten grams of a radioactive...Ch. 5.1 - Radioactive Decay The decay constant for the...Ch. 5.1 - Drug ConstantRadioactive cobalt 60 has a half-life...Ch. 5.1 - Iodine Level in Dairy Products If dairy cows eat...Ch. 5.1 - Half-Life Ten grams of a radioactive material...Ch. 5.1 - Decay of Sulfate in the Bloodstream In an animal...Ch. 5.1 - Radioactive Decay Forty grams of a certain...Ch. 5.1 - Radioactive Decay A sample of radioactive material...Ch. 5.1 - Rate of Decay A sample of radioactive material has...Ch. 5.1 - Carbon Dating In 1947, a cave with beautiful...Ch. 5.1 - King Arthur's Round Table According to legend, in...Ch. 5.1 - Prob. 49ECh. 5.1 - Population of the PacificNorthwest In 1938,...Ch. 5.1 - Time of the Fourth Ice Age Many scientists believe...Ch. 5.1 - Time Constant Let T be the time constant of the...Ch. 5.1 - Prob. 53ECh. 5.1 - Time Constant and Half-life Consider as...Ch. 5.1 - An Initial Value Problem Suppose that the function...Ch. 5.1 - Time to Finish Consider the exponential decay...Ch. 5.2 - One thousand dollars is to be invested in a bank...Ch. 5.2 - A building was bought for 150,000 and sold 10...Ch. 5.2 - Savings Account Let A(t)=5000e0.04t be the balance...Ch. 5.2 - Savings Account Let A(t) be the balance in a...Ch. 5.2 - Savings Account Four thousand dollars is deposited...Ch. 5.2 - Savings Account Ten thousand dollars is deposited...Ch. 5.2 - Investment AnalysisAn investment earns 4.2 yearly...Ch. 5.2 - Investment Analysis An investment earns 5.1 yearly...Ch. 5.2 - Continuous Compound One thousand dollars is...Ch. 5.2 - Continuous Compound Ten thousand dollars is...Ch. 5.2 - Technology Stock One hundred shares of a...Ch. 5.2 - Appreciation of Art Work Pablo Picassos Angel...Ch. 5.2 - Investment Analysis How many years are required...Ch. 5.2 - Doubling an Investment What yearly interest rate...Ch. 5.2 - Tripling an Investment If an investment triples in...Ch. 5.2 - Prob. 14ECh. 5.2 - Prob. 15ECh. 5.2 - Prob. 16ECh. 5.2 - Real Estate Investment A farm purchased in 2000...Ch. 5.2 - Real Estate Investment A parcel of land bought in...Ch. 5.2 - Present Value Find the present value of 1000...Ch. 5.2 - Prob. 20ECh. 5.2 - Present Value How much money must you invest now...Ch. 5.2 - Present Value If the present value of 1000 to be...Ch. 5.2 - Prob. 23ECh. 5.2 - Prob. 24ECh. 5.2 - Differential Equation and InterestA small amount...Ch. 5.2 - Prob. 26ECh. 5.2 - Prob. 27ECh. 5.2 - Prob. 28ECh. 5.2 - Prob. 29ECh. 5.2 - Prob. 30ECh. 5.2 - Prob. 31ECh. 5.3 - The current toll for the use of a certain toll...Ch. 5.3 - The current toll for the use of a certain toll...Ch. 5.3 - The current toll for the use of a certain toll...Ch. 5.3 - Find the logarithmic derivative and then determine...Ch. 5.3 - Prob. 2ECh. 5.3 - Find the logarithmic derivative and then determine...Ch. 5.3 - Find the logarithmic derivative and then determine...Ch. 5.3 - Find the logarithmic derivative and then determine...Ch. 5.3 - Prob. 6ECh. 5.3 - Find the logarithmic derivative and then determine...Ch. 5.3 - Prob. 8ECh. 5.3 - Percentage Rate of Growth The annual sales S(in...Ch. 5.3 - Prob. 10ECh. 5.3 - Price of Ground Beef The wholesale price in...Ch. 5.3 - Price of Pork The wholesale price in dollars of...Ch. 5.3 - For each demand function, find E(p) and determine...Ch. 5.3 - Prob. 14ECh. 5.3 - For each demand function, find E(p) and determine...Ch. 5.3 - For each demand function, find E(p) and determine...Ch. 5.3 - For each demand function, find E(p) and determine...Ch. 5.3 - Prob. 18ECh. 5.3 - Elasticity of Demand Currently 1800 people ride a...Ch. 5.3 - Prob. 20ECh. 5.3 - Elasticity of Demand A movie theater has a seating...Ch. 5.3 - Prob. 22ECh. 5.3 - Elasticity of Demand A country that is the major...Ch. 5.3 - Prob. 24ECh. 5.3 - Prob. 25ECh. 5.3 - Prob. 26ECh. 5.3 - Prob. 27ECh. 5.3 - Prob. 28ECh. 5.3 - Prob. 29ECh. 5.4 - A sociological study was made to examine the...Ch. 5.4 - Consider the function f(x)=5(1e2x), x0. a. Show...Ch. 5.4 - Prob. 2ECh. 5.4 - Prob. 3ECh. 5.4 - Prob. 4ECh. 5.4 - Prob. 5ECh. 5.4 - Ebbinghaus Model for Forgetting A student learns a...Ch. 5.4 - Spread of News When a grand jury indicted the...Ch. 5.4 - Prob. 8ECh. 5.4 - Spread of News A news item is spread by word of...Ch. 5.4 - Prob. 10ECh. 5.4 - Spread of News A news item is broadcast by mass...Ch. 5.4 - Glucose Elimination Describe an experiment that a...Ch. 5.4 - Amount of a Drug in the Bloodstream After a drug...Ch. 5.4 - Growth with Restriction A model incorporating...Ch. 5 - What differential equation is key to solving...Ch. 5 - Prob. 2CCECh. 5 - Prob. 3CCECh. 5 - Explain how radiocarbon dating works.Ch. 5 - Prob. 5CCECh. 5 - Prob. 6CCECh. 5 - Define the elasticity of demand, E(p), for a...Ch. 5 - Describe an application of the differential...Ch. 5 - Prob. 9CCECh. 5 - Atmospheric Pressure The atmospheric pressure...Ch. 5 - Population Model The herring gull population in...Ch. 5 - Present Value Find the present value of 10,000...Ch. 5 - Compound Interest One thousand dollars is...Ch. 5 - Half-Life The half-life of the radioactive element...Ch. 5 - Carbon Dating A piece of charcoal found at...Ch. 5 - Population Model From January 1, 2010, to January...Ch. 5 - Compound Interest A stock portfolio increased in...Ch. 5 - Comparing Investments An investor initially...Ch. 5 - Bacteria Growth Two different bacteria colonies...Ch. 5 - Population Model The population of a city t years...Ch. 5 - Bacteria Growth A colony of bacteria is growing...Ch. 5 - Population Model The population of a certain...Ch. 5 - Radioactive Decay You have 80 grams of a certain...Ch. 5 - Compound Interest A few years after money is...Ch. 5 - Compound Interest The current balance in a savings...Ch. 5 - Find the percentage rate of change of the function...Ch. 5 - Find E(p) for the demand function q=400040p2, and...Ch. 5 - Elasticity of Demand For a certain demand...Ch. 5 - Find the percentage rate of change of the function...Ch. 5 - Elasticity of Demand Company can sell...Ch. 5 - Elasticity of Demand Consider a demand function of...Ch. 5 - Refer to Check Your Understanding 5.4. Out of 100...Ch. 5 - Height of a Weed The growth of the yellow nutsedge...Ch. 5 - Temperature of a Rod When a rod of molten steel...Ch. 5 - Prob. 26RE
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- The table shows the mid-year populations (in millions) of five countries in 2015 and the projected populations (in millions) for the year 2025. (a) Find the exponential growth or decay model y=aebt or y=aebt for the population of each country by letting t=15 correspond to 2015. Use the model to predict the population of each country in 2035. (b) You can see that the populations of the United States and the United Kingdom are growing at different rates. What constant in the equation y=aebt gives the growth rate? Discuss the relationship between the different growth rates and the magnitude of the constant.arrow_forwardSuppose that the initial mass of radioactive substance is m0 and the half-life of the substance is h. Let m(t) be the mass remaining at time t. a What is meant by the half-life h? b Write a formula for m(t) in terms of the half-life h. c Write a formula for the relative decay rate r in terms of the half-life h. d Write a formula for m(t) in terms of the relative decay rate r.arrow_forwardThe function f(x)=5x is an exponential function with base______; f(2) =_______, f(0) =______, f(2) =_______, and f(6) =_______.arrow_forward
- Radioactive Decay The half-life of radium-226 is 1590 years. a If a sample has a mass of 150 mg, find a function that models the mass that remains after t years. b Find the mass that will remain after 1000 years. c After how many years will only 50 mg remain?arrow_forwardSuppose that the initial size of a population is n0 and the population grows exponentially. Let n(t) be the size of the population at time t. (a) Write a formula for n(t) in terms of the doubling time a. (b) Write a formula for n(t) in terms of the relative growth rate r.arrow_forwardRadioactive Decay The half-life of radium-226 is 1590 years. (a)If a sample has a mass of 150 mg, find a function that models the mass that remains after tyears. (b)Find the mass that will remain after 1000 years. (c)After how many years will only 50 mg remain?arrow_forward
- Population The table shows the mid-year populations (in millions) of five countries in 2015 and the projected populations (in millions) for the year 2025. (a) Find the exponential growth or decay model y=aebt or y=aebt for the population of each country by letting t=15 correspond to 2015. Use the model to predict the population of each country in 2035. (b) You can see that the populations of the United States and the United Kingdom are growing at different rates. What constant in the equation y=aebt gives the growth rate? Discuss the relationship between the different growth rates and the magnitude of the constant.arrow_forwardMatch the exponential function with one of the graphs labeled I,II,III and IV, shown below. (a) f(x)=2x (b) f(x)=2x (c) f(x)=2x (d) f(x)=2xarrow_forwardGrowth Rate Versus Weight Ecologists have studied how a populations intrinsic exponential growth rate r is related to the body weight W for herbivorous mammals. In table 5.2, W is the adult weight measured in pounds, and r is growth rate per year. Animal Weight W r Short-tailed vole 0.07 4.56 Norway rat 0.7 3.91 Rue deer 55 0.23 White-tailed deer 165 0.55 American elk 595 0.27 African elephant 8160 0.06 Find a formula that models r as a power function of W, and draw a graph of this function.arrow_forward
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