Student Solutions Manual for Calculus & Its Applications and Calculus & Its Applications, Brief Version
14th Edition
ISBN: 9780134463230
Author: Larry J. Goldstein, David I Lay, David I. Schneider, Nakhle H. Asmar
Publisher: PEARSON
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Chapter 5, Problem 21RE
Elasticity of Demand Company can sell
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6.
(i)
Sketch the trace of the following curve on R²,
(t) = (sin(t), 3 sin(t)),
tЄ [0, π].
[3 Marks]
Total marks 10
(ii)
Find the length of this curve.
[7 Marks]
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Chapter 5 Solutions
Student Solutions Manual for Calculus & Its Applications and Calculus & Its Applications, Brief Version
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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- 7. Let F(x1, x2) (F₁(x1, x2), F2(x1, x2)), where = X2 F1(x1, x2) X1 F2(x1, x2) x+x (i) Using the definition, calculate the integral LF.dy, where (t) = (cos(t), sin(t)) and t = [0,2]. [5 Marks] (ii) Explain why Green's Theorem cannot be used to find the integral in part (i). [5 Marks]arrow_forward6. Sketch the trace of the following curve on R², п 3п (t) = (t2 sin(t), t2 cos(t)), tЄ 22 [3 Marks] Find the length of this curve. [7 Marks]arrow_forwardTotal marks 10 Total marks on naner: 80 7. Let DCR2 be a bounded domain with the boundary OD which can be represented as a smooth closed curve : [a, b] R2, oriented in the anticlock- wise direction. Use Green's Theorem to justify that the area of the domain D can be computed by the formula 1 Area(D) = ½ (−y, x) · dy. [5 Marks] (ii) Use the area formula in (i) to find the area of the domain D enclosed by the ellipse y(t) = (10 cos(t), 5 sin(t)), t = [0,2π]. [5 Marks]arrow_forward
- Total marks 15 Total marks on paper: 80 6. Let DCR2 be a bounded domain with the boundary ǝD which can be represented as a smooth closed curve : [a, b] → R², oriented in the anticlockwise direction. (i) Use Green's Theorem to justify that the area of the domain D can be computed by the formula 1 Area(D) = . [5 Marks] (ii) Use the area formula in (i) to find the area of the domain D enclosed by the ellipse (t) = (5 cos(t), 10 sin(t)), t = [0,2π]. [5 Marks] (iii) Explain in your own words why Green's Theorem can not be applied to the vector field У x F(x,y) = ( - x² + y²²x² + y² ). [5 Marks]arrow_forwardTotal marks 15 པ་ (i) Sketch the trace of the following curve on R2, (t) = (t2 cos(t), t² sin(t)), t = [0,2π]. [3 Marks] (ii) Find the length of this curve. (iii) [7 Marks] Give a parametric representation of a curve : [0, that has initial point (1,0), final point (0, 1) and the length √2. → R² [5 Marks] Turn over. MA-201: Page 4 of 5arrow_forwardTotal marks 15 5. (i) Let f R2 R be defined by f(x1, x2) = x² - 4x1x2 + 2x3. Find all local minima of f on R². (ii) [10 Marks] Give an example of a function f: R2 R which is not bounded above and has exactly one critical point, which is a minimum. Justify briefly your answer. [5 Marks] 6. (i) Sketch the trace of the following curve on R2, y(t) = (sin(t), 3 sin(t)), t = [0,π]. [3 Marks]arrow_forward
- A ladder 25 feet long is leaning against the wall of a building. Initially, the foot of the ladder is 7 feet from the wall. The foot of the ladder begins to slide at a rate of 2 ft/sec, causing the top of the ladder to slide down the wall. The location of the foot of the ladder, its x coordinate, at time t seconds is given by x(t)=7+2t. wall y(1) 25 ft. ladder x(1) ground (a) Find the formula for the location of the top of the ladder, the y coordinate, as a function of time t. The formula for y(t)= √ 25² - (7+2t)² (b) The domain of t values for y(t) ranges from 0 (c) Calculate the average velocity of the top of the ladder on each of these time intervals (correct to three decimal places): . (Put your cursor in the box, click and a palette will come up to help you enter your symbolic answer.) time interval ave velocity [0,2] -0.766 [6,8] -3.225 time interval ave velocity -1.224 -9.798 [2,4] [8,9] (d) Find a time interval [a,9] so that the average velocity of the top of the ladder on this…arrow_forwardTotal marks 15 3. (i) Let FRN Rm be a mapping and x = RN is a given point. Which of the following statements are true? Construct counterex- amples for any that are false. (a) If F is continuous at x then F is differentiable at x. (b) If F is differentiable at x then F is continuous at x. If F is differentiable at x then F has all 1st order partial (c) derivatives at x. (d) If all 1st order partial derivatives of F exist and are con- tinuous on RN then F is differentiable at x. [5 Marks] (ii) Let mappings F= (F1, F2) R³ → R² and G=(G1, G2) R² → R² : be defined by F₁ (x1, x2, x3) = x1 + x², G1(1, 2) = 31, F2(x1, x2, x3) = x² + x3, G2(1, 2)=sin(1+ y2). By using the chain rule, calculate the Jacobian matrix of the mapping GoF R3 R², i.e., JGoF(x1, x2, x3). What is JGOF(0, 0, 0)? (iii) [7 Marks] Give reasons why the mapping Go F is differentiable at (0, 0, 0) R³ and determine the derivative matrix D(GF)(0, 0, 0). [3 Marks]arrow_forward5. (i) Let f R2 R be defined by f(x1, x2) = x² - 4x1x2 + 2x3. Find all local minima of f on R². (ii) [10 Marks] Give an example of a function f: R2 R which is not bounded above and has exactly one critical point, which is a minimum. Justify briefly Total marks 15 your answer. [5 Marks]arrow_forward
- Total marks 15 4. : Let f R2 R be defined by f(x1, x2) = 2x²- 8x1x2+4x+2. Find all local minima of f on R². [10 Marks] (ii) Give an example of a function f R2 R which is neither bounded below nor bounded above, and has no critical point. Justify briefly your answer. [5 Marks]arrow_forward4. Let F RNR be a mapping. (i) x ЄRN ? (ii) : What does it mean to say that F is differentiable at a point [1 Mark] In Theorem 5.4 in the Lecture Notes we proved that if F is differentiable at a point x E RN then F is continuous at x. Proof. Let (n) CRN be a sequence such that xn → x ЄERN as n → ∞. We want to show that F(xn) F(x), which means F is continuous at x. Denote hnxn - x, so that ||hn|| 0. Thus we find ||F(xn) − F(x)|| = ||F(x + hn) − F(x)|| * ||DF (x)hn + R(hn) || (**) ||DF(x)hn||+||R(hn)||| → 0, because the linear mapping DF(x) is continuous and for all large nЄ N, (***) ||R(hn) || ||R(hn) || ≤ → 0. ||hn|| (a) Explain in details why ||hn|| → 0. [3 Marks] (b) Explain the steps labelled (*), (**), (***). [6 Marks]arrow_forward4. In Theorem 5.4 in the Lecture Notes we proved that if F: RN → Rm is differentiable at x = RN then F is continuous at x. Proof. Let (xn) CRN be a sequence such that x → x Є RN as n → ∞. We want F(x), which means F is continuous at x. to show that F(xn) Denote hn xnx, so that ||hn||| 0. Thus we find ||F (xn) − F(x) || (*) ||F(x + hn) − F(x)|| = ||DF(x)hn + R(hn)|| (**) ||DF(x)hn|| + ||R(hn) || → 0, because the linear mapping DF(x) is continuous and for all large n = N, |||R(hn) || ≤ (***) ||R(hn)|| ||hn|| → 0. Explain the steps labelled (*), (**), (***) [6 Marks] (ii) Give an example of a function F: RR such that F is contin- Total marks 10 uous at x=0 but F is not differentiable at at x = 0. [4 Marks]arrow_forward
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