Stewart – Calculus ET 8e Chapter 8. All Answers

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© 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 1. Find the area of the surface obtained by r ... otating the curve about the -axis. 2. Find the coordinates of the centroid for the region bounded by the curves , x = 0, and y = . 3. Find the centroid of the region shown, not by integration, but by locating the centroids of the rectangles and triangles and using additivity of moments. 4. For a given commodity and pure competition, the number of units produced and the price per unit are determined as the coordinates of the point of intersection of the supply and demand curves. Given the demand curve and the supply curve , find the consumer surplus. 5. A movie theater has been charging $ .00 per person and selling about tickets on a typical weeknight. After surveying their customers, the theater estimates that for every $ that they lower the price, the number of moviegoers will increase by per night. Find the demand function and calculate the consumer surplus when the tickets are priced at $ .Stewart – Calculus ET 8e Chapter 8 Form A © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 6. Boxes are labeled as containing 500 g of cereal. The machine filling the boxes produces weights that are normally distributed with standard deviation 12 g. If the target weight is 500 g, what is the probability that the machine produces a box with less than g of cereal? Round your answer to four decimal places. 7. The manager of a fast-food restaurant determines that the average time that her customers wait for service is 2 minutes. The manager wants to advertise that anybody who isn't served within a certain number of minutes gets a free hamburger. But she doesn't want to give away free hamburgers to more than % of her customers. What value of x must she use in the advertisement “if you aren't served within x minutes, you get a free hamburger”? 8. A type of lightbulb is labeled as having an average lifetime of hours. It's reasonable to model the probability of failure of these bulbs by an exponential density function with mean µ = . What is the median lifetime of these lightbulbs? Give your answer rounded to two decimal places. 9. Let the function whose graph is shown be a probability density function. Calculate the mean. 10. Let a) For what value of c is f a probability density function? b) For that value of c, find P (–1 < X < 1).Stewart – Calculus ET 8e Chapter 8 Form A © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 11. Write an integral giving the arc length of the graph of the equation from P to Q. y = ; P (1, 1 3), Q (3, 11 1 ) 12. For the following exercise, (a) plot the graph of the function f, (b) write an integral giving the arc length of the graph of the function over the indicated interval, and (c) find the arc length of the curve accurate to two decimal places. = x – 2 ; [0, 3] 13. Find the area of the surface obtained by revolving the given curve about the y-axis. x = on [0, 2] 14. An aquarium is 3 ft long, 2 ft wide, and 2 ft deep. If the aquarium is filled with water, find the force exerted by the water (a) on the bottom of the aquarium, (b) on the longer side of the aquarium, and (c) on the shorter side of the aquarium. (The weight density of water is 62.4 lb/ft3.) 15. A cylindrical drum of diameter 6 ft and length 9 ft is lying on its side, submerged in water 10 ft deep. Find the force exerted by the water on one end of the drum to the nearest pound. (The weight density of water is 62.4 lb/ft3.) 16. You are given the shape of the vertical ends of a trough that is completely filled with water. Find the force exerted by the water on one end of the trough. (The weight density of water is 62.4 lb/ft3.) 5 ft 7 ft 9 ft 17. Find the centroid of the region bounded by the graphs of the given equations. 18. Find the center of mass of the system comprising masses mk located at the points Pk in a coordinate plane. Assume that mass is measured in grams and distance is measured in centimeters. m1 = 2, m2 = 3, m3 = 5 P1 (–5, –1), P2 (–4, –2), P3 (4, –2)Stewart – Calculus ET 8e Chapter 8 Form A © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 19. Find the centroid of the region shown in the figure. –1 1 –1 1 x y 20. Find the center of mass of the lamina of the region shown if the density of the circular lamina is six times that of the rectangular lamina. –2 2 x 1 –1 yStewart – Calculus ET 8e Chapter 8 Form A © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Answer Key 1. 2. 3. 4. 5. 2,450 6. 7. 8. 9. 10. a) , b) 11. 12. a. 1 2 3 4 5 6 x 2 1 –1 –2 –3 y b. c. 3.71 13. (145 145 – 1)Stewart – Calculus ET 8e Chapter 8 Form A © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 14. a. 748.8 lb b. 374.4 lb c. 249.6 lb 15. lb 16. 6,500 lb 17. 18. 19. 20.Stewart – Calculus ET 8e Chapter 8 Form B © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 1. Set up, but do not evaluate, an integral for the length of the curve. 2. A hawk flying at an altitude of m accidentally drops its prey. The parabolic trajectory of the falling prey is described by the equation until it hits the ground, where y is its height above the ground and x is the horizontal distance traveled in meters. True or False? The distance traveled by the prey from the time it is dropped until the time it hits the ground is approximately m. 3. Use the arc length formula to find the length of the curve. 4. A steady wind blows a kite due west. The kite's height above ground from horizontal position to ft is given by . Find the distance traveled by the kite. Give your answer rounded to two decimal places. 5. Find the area of the surface obtained by rotating the curve about the -axis. 6. Find the coordinates of the centroid for the region bounded by the curves , x = 0, and y = . 7. A swimming pool is 10 ft wide and 36 ft long and its bottom is an inclined plane, the shallow end having a depth of ft and the deep end, 12 ft. If the pool is full of water, find the hydrostatic force on the shallow end. (Use the fact that water weighs 62.5 lb/ .)Stewart – Calculus ET 8e Chapter 8 Form B © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 8. Find the exact coordinates of the centroid. 9. Find the centroid of the region bounded by the curves. 10. Find the center of mass of a lamina in the shape of a quarter-circle with radius with density = . 11. A demand curve is given by . Find the consumer surplus when the selling price is $ .Stewart – Calculus ET 8e Chapter 8 Form B © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 12. For a given commodity and pure competition, the number of units produced and the price per unit are determined as the coordinates of the point of intersection of the supply and demand curves. Given the demand curve and the supply curve , find the consumer surplus. 13. A movie theater has been charging $ .00 per person and selling about tickets on a typical weeknight. After surveying their customers, the theater estimates that for every $ that they lower the price, the number of moviegoers will increase by per night. Find the demand function and calculate the consumer surplus when the tickets are priced at $ . 14. The manager of a fast-food restaurant determines that the average time that her customers wait for service is 2 minutes. The manager wants to advertise that anybody who isn't served within a certain number of minutes gets a free hamburger. But she doesn't want to give away free hamburgers to more than % of her customers. What value of x must she use in the advertisement “if you aren't served within x minutes, you get a free hamburger”? 15. Let a) For what value of c is f a probability density function? b) For that value of c, find P (–1 < X < 1). 16. Find the area of the surface obtained by revolving the graph of y = on [0, 1] about the x-axis. 17. A cylindrical drum of diameter 2 ft and length 5 ft is lying on its side, submerged in water 17 ft deep. Find the force exerted by the water on one end of the drum to the nearest pound. (The weight density of water is 62.4 lb/ft3.)Stewart – Calculus ET 8e Chapter 8 Form B © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 18. You are given the shape of the vertical ends of a trough that is completely filled with water. Find the force exerted by the water on one end of the trough. (The weight density of water is 62.4 lb/ft3.) 5 ft 8 ft 10 ft 19. A vertical plate is submerged in water (the surface of the water coincides with the x-axis). Find the force exerted by the water on the plate. (The weight density of water is 62.4 lb/ft3.) (ft) 1 2 3 4 5 x 1 –1 –2 –3 –4 y (ft) 20. Find the centroid of the region bounded by the graphs of the given equations.Stewart – Calculus ET 8e Chapter 8 Form B © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Answer Key 1. 2. T 3. 4. ft 5. 6. 7. 8. 9. 10. 11. 12. 13. 3,125 14. 15. a) , b) 16. 2 17. lb 18. 7,280 lb 19. 416 lb 20.Stewart - Calculus ET 8e Chapter 8 Form C © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Select the correct answer for each question. ____ 1. Find the length of the curve. a. b. c. d. e. ____ 2. Use Simpson’s Rule with n = 6 to estimate the length of the curve , . Round your answer to six decimal places. a. 6.987208 b. 6.947368 c. 6.972089 d. 6.947582 e. None of theseStewart - Calculus ET 8e Chapter 8 Form C © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 3. Find the arc length of the graph from A to B. (1, 3) (4, 10) A B y = x3/2 + 2 1 2 3 4 5 x 8 6 4 2 10 12 14 16 18 20 22 24 y a. 13 13) b. 13 13) c. 13 13) d. 13 13)Stewart - Calculus ET 8e Chapter 8 Form C © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 4. Set up, but do not evaluate, an integral for the length of the curve. a. b. c. d. e. ____ 5. Find the area of the surface obtained by rotating the circle about the line . a. b. c. d. e.Stewart - Calculus ET 8e Chapter 8 Form C © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 6. Write an integral giving the area of the surface obtained by revolving the curve about the x-axis. (Do not evaluate the integral.) y = on [4, 5] a.  b.  c. 4 d. 4 ____ 7. A gate in an irrigation canal is constructed in the form of a trapezoid ft wide at the bottom, ft wide at the top, and 2 ft high. It is placed vertically in the canal, with the water extending to its top. Find the hydrostatic force on one side of the gate. a. 166 lb b. 21 lb c. 67lb d. 666 lb e. None of theseStewart - Calculus ET 8e Chapter 8 Form C © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 8. You are given the shape of the vertical ends of a trough that is completely filled with water. Find the force exerted by the water on one end of the trough. (The weight density of water is 62.4 lb/ft3.) 5 ft 6 ft a. 780 lb b. 312 lb c. 156 lb d. 1,560 lb ____ 9. You are given the shape of the vertical ends of a trough that is completely filled with water. Find the force exerted by the water on one end of the trough. (The weight density of water is 62.4 lb/ft3.) 4 ft a. 666 lb b. 1,331 lb c. 2,662 lb d. 333 lbStewart - Calculus ET 8e Chapter 8 Form C © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 10. Find the centroid of the region bounded by the graphs of the given equations. a. b. c. d. ____ 11. A trough is filled with a liquid of density 855 kg/ . The ends of the trough are equilateral triangles with sides m long and vertex at the bottom. Find the hydrostatic force on one end of the trough. a. b. c. d. e. ____ 12. Find the centroid of the region bounded by the given curves. a. b. c. 28 75, 184 105 d. e. None of theseStewart - Calculus ET 8e Chapter 8 Form C © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 13. Find the centroid of the region bounded by the given curves. a. b. c. d. e. ____ 14. A rectangular tank has width 3 ft, height 2 ft, and length 7 ft. It is filled with equal volumes of water and oil. The oil has a weight density of 50 lb/ft3 and floats on the water. Find the force exerted by the mixture on one end of the tank. (The weight density of water is 62.4 lb/ft3.) a. 319 lb b. 356 lb c. 337 lb d. 169 lb ____ 15. Find the centroid of the region bounded by the graphs of the given equations. a. b. c. d.Stewart - Calculus ET 8e Chapter 8 Form C © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 16. Dye dilution is a method of measuring cardiac output. If A mg of dye is used and c(t) is the concentration of the dye at time t, then the cardiac output over the time interval [0, T ] is given by Find the cardiac output over the time interval [0, 15] if the dye dilution method is used with mg of dye and the dye concentration, in mg/L, is modeled by , where t is measured in seconds. a. 0.029 b. 0.039 c. 0.026 d. 0.044 e. f. 0.020 ____ 17. The marginal revenue from producing x units of a certain product is (in dollars per unit). Find the increase in revenue if the production level is raised from 1,100 units to units. a. $ b. $51,367,000 c. $17,765,250 d. $26,866,667 e. $37,974,583Stewart - Calculus ET 8e Chapter 8 Form C © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 18. The demand function for a commodity is given by . Find the consumer surplus when the sales level is . a. $9,167 b. $ c. $11,167 d. $8,167 e. $10,167 ____ 19. The standard deviation for a random variable with probability density function f and mean µ is defined . Find the standard deviation for an exponential density function with mean . a. b. c. d. e. ____ 20. Suppose the average waiting time for a customer's call to be answered by a company representative (modeled by exponentially decreasing probability density functions) is minutes. Find the median waiting time. a. minutes b. minutes c. minutes d. minutes e. minutesStewart - Calculus ET 8e Chapter 8 Form C © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Answer Key 1. E 2. D 3. C 4. E 5. E 6. D 7. D 8. D 9. C 10. D 11. B 12. C 13. C 14. D 15. D 16. E 17. A 18. B 19. E 20. AStewart – Calculus ET 8e Chapter 8 Form D © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Select the correct answer for each question. ____ 1. Find the length of the curve. a. b. c. d. e. None of these ____ 2. Find the area of the surface obtained by rotating the circle about the line . a. b. c. d. e. ____ 3. A trough is filled with a liquid of density 855 kg/ . The ends of the trough are equilateral triangles with sides m long and vertex at the bottom. Find the hydrostatic force on one end of the trough. a. b. c. d. e.Stewart – Calculus ET 8e Chapter 8 Form D © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 4. Find the arc length of the graph of the given equation on the specified interval. y = 23 ( + 1) , [2, 3] a. 41 3 b. 41 2 c. 41 4 d. 41 6 ____ 5. Set up, but do not evaluate, an integral for the length of the curve. a. b. c. d. e.Stewart – Calculus ET 8e Chapter 8 Form D © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 6. Set up, but do not evaluate, an integral for the area of the surface obtained by rotating the curve about the x-axis on the interval . a. b. c. d. e.Stewart – Calculus ET 8e Chapter 8 Form D © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 7. Write an integral giving the area of the surface obtained by revolving the curve about the x-axis. (Do not evaluate the integral.) y = on [1, 5] a.  b. 4 c. 4 d.  ____ 8. Find the centroid of the region bounded by the graphs of the given equations. a. b. c. d.Stewart – Calculus ET 8e Chapter 8 Form D © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 9. The masses are located at the points . Find the moments and and the center of mass of the system. ; a. b. c. d. e. ____ 10. The marginal revenue from producing x units of a certain product is (in dollars per unit). Find the increase in revenue if the production level is raised from 1,100 units to units. a. $37,974,583 b. $26,866,667 c. $17,765,250 d. $ e. $51,367,000Stewart – Calculus ET 8e Chapter 8 Form D © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 11. The marginal cost function is defined to be the derivative of the cost function. If the marginal cost of manufacturing x units of a product is (measured in dollars per unit) and the fixed start-up cost is , use the Total Change Theorem to find the cost of producing the first 5,000 units. a. $354,445,000 b. $354,345,000 c. $354,845,000 d. $354,545,000 e. $ ____ 12. A vertical plate is submerged in water (the surface of the water coincides with the x-axis). Find the force exerted by the water on the plate. (The weight density of water is 62.4 lb/ft3.) (ft) 1 2 3 4 5 x 1 –1 –2 –3 –4 y (ft) a. 624 lb b. 62 lb c. 125 lb d. 312 lb ____ 13. Find the length of the curve. a. b. c. d. e.Stewart – Calculus ET 8e Chapter 8 Form D © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 14. If f (x) is the probability density function for the blood cholesterol level of men over the age of 40, where x is measured in milligrams per deciliter, express as an integral the probability that the cholesterol level of such a man lies between 195 and . a. b. c. d. e. ____ 15. Dye dilution is a method of measuring cardiac output. If A mg of dye is used and c(t) is the concentration of the dye at time t, then the cardiac output over the time interval [0, T ] is given by Find the cardiac output over the time interval [0, 15] if the dye dilution method is used with mg of dye and the dye concentration, in mg/L, is modeled by , where t is measured in seconds. a. 0.031 b. 0.043 c. 0.029 d. 0.049 e. f. 0.022Stewart – Calculus ET 8e Chapter 8 Form D © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 16. Find the centroid of the region bounded by the given curves. a. b. 28 75, 92 105 c. d. e. None of these ____ 17. Find the area of the surface obtained by revolving the given curve about the x-axis. on a. b. c. d. ____ 18. Use the Theorem of Pappus to find the volume of the solid obtained by revolving the region bounded by the graphs of and about the y-axis. a. 128 b. 512 3  c. 128 3  d. 32Stewart – Calculus ET 8e Chapter 8 Form D © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 19. According to the National Health Survey, the heights of adult males in the United States are (normally distributed with mean) 73 inches, and standard deviation of 2.8 inches. What is the probability that an adult male chosen at random is between inches and inches tall? a. 0.759 b. c. 0.2812 d. 0.6512 e. 0.7154 f. 0.5528 ____ 20. The standard deviation for a random variable with probability density function f and mean µ is defined . Find the standard deviation for an exponential density function with mean . a. b. c. d. e.Stewart – Calculus ET 8e Chapter 8 Form D © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Answer Key 1. E 2. D 3. E 4. A 5. B 6. C 7. C 8. C 9. C 10. D 11. E 12. D 13. D 14. D 15. E 16. B 17. B 18. A 19. B 20. AStewart – Calculus ET 8e Chapter 8 Form E © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 1. Find the length of the curve. Select the correct answer. a. b. 25.05 c. 13.05 d. 36.05 e. None of these ____ 2. Use Simpson’s Rule with n = 6 to estimate the length of the curve , . Round your answer to six decimal places. Select the correct answer. a. 6.987208 b. 6.947368 c. 6.972089 d. 6.947582 e. None of these 3. Find the arc length of the graph of the given equation on the specified interval. y = 23 ( + 1) , [2, 5] ____ 4. Use differentials to approximate the arc length of the graph of the equation from P to Q. Round answer to four decimal places. Select the correct answer. P (3, 12), Q (3.2, 13.24) a. 6.0828 b. 3.6497 c. 1.2166 d. 2.4331 5. Find the arc length function for the curve with starting point . 6. Set up, but do not evaluate, an integral for the area of the surface obtained by rotating the curve about the x-axis on the interval . 7. Set up, but do not evaluate, an integral for the area of the surface obtained by rotating the curve about the given axis. y-axisStewart – Calculus ET 8e Chapter 8 Form E © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 8. Find the area of the surface obtained by rotating the curve about the x-axis. ____ 9. Find the area of the surface obtained by rotating the circle about the line . Select the correct answer. a. b. c. d. e. ____ 10. If the infinite curve , is rotated about the x-axis , find the area of the resulting surface. Select the correct answer. a. b. c. d. e. ____ 11. A trough has vertical ends that are equilateral triangles with sides of length 7 ft. If the trough is filled with water to a depth of 4 ft, find the force exerted by the water on one end of the trough. Round to one decimal place. (The weight density of water is 62.4 lb/ft3.) Select the correct answer. a. 384.3 lb b. 1,337.7 lb c. 768.6 lb d. 2,675.4 lbStewart – Calculus ET 8e Chapter 8 Form E © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 12. Find the centroid of the region bounded by the graphs of the given equations. 13. Find the centroid of the region bounded by the given curves. 14. Find the centroid of the region bounded by the graphs of the given equations. ____ 15. The marginal cost function is defined to be the derivative of the cost function. If the marginal cost of manufacturing x units of a product is (measured in dollars per unit) and the fixed start-up cost is , use the Total Change Theorem to find the cost of producing the first 5,000 units. Select the correct answer. a. $354,645,000 b. $354,845,000 c. $ d. $354,545,000 e. $354,745,000 16. Dye dilution is a method of measuring cardiac output. If A mg of dye is used and c(t) is the concentration of the dye at time t, then the cardiac output over the time interval [0, T ] is given by Find the cardiac output over the time interval [0, 15] if the dye dilution method is used with mg of dye and the dye concentration, in mg/L, is modeled by , where t is measured in seconds.Stewart – Calculus ET 8e Chapter 8 Form E © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 17. The marginal revenue from producing x units of a certain product is (in dollars per unit). Find the increase in revenue if the production level is raised from 1,100 units to units. Select the correct answer. a. $37,974,583 b. $51,367,000 c. $26,866,667 d. $17,765,250 e. $ 18. The demand function for a commodity is given by . Find the consumer surplus when the sales level is . 19. A hot, wet summer is causing a mosquito population explosion in a lake resort area. The number of mosquitoes is increasing at an estimated rate of per week (where t is measured in weeks). By how much does the mosquito population increase between the 4th and th weeks of summer? 20. The standard deviation for a random variable with probability density function f and mean µ is defined . Find the standard deviation for an exponential density function with mean .Stewart – Calculus ET 8e Chapter 8 Form E © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Answer Key 1. A 2. D 3. 81 4. C 5. 6. 7. 8. 21 2 9. B 10. A 11. C 12. 13. 28 75, 92 105 14. 15. C 16. 17. E 18. $ 19. 20.Stewart – Calculus ET 8e Chapter 8 Form F © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 1. Find the length of the curve. Select the correct answer. a. b. 36.05 c. 13.05 d. 25.05 e. None of these 2. Find the arc length of the graph from A to B. (1, 2) (4, 9) A B y = x3/2 + 1 1 2 3 4 5 x 8 6 4 2 10 12 14 16 18 20 22 24 y 3. Use differentials to approximate the arc length of the graph of the equation from P to Q. Round answer to four decimal places. P (1, 4), Q (1.2, 4.728) ____ 4. Find the length of the line segment joining the two given points by finding the equation of the line using Equation (2). Then check your answer by using the distance formula. Select the correct answer. (0, 0), (4, 6) a. 2 13 b. 10 c. 10 d. 2Stewart – Calculus ET 8e Chapter 8 Form F © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 5. Find the area of the surface obtained by rotating the curve about the x-axis. 6. A vertical plate is submerged in water (the surface of the water coincides with the x-axis). Find the force exerted by the water on the plate. (The weight density of water is 62.4 lb/ft3.) (ft) 1 2 3 4 5 x 1 –1 –2 –3 –4 y (ft) 7. Use Simpson’s Rule with n = 6 to estimate the length of the curve , . Round your answer to six decimal places. ____ 8. Find the area of the surface obtained by rotating the circle about the line . Select the correct answer. a. b. c. d. e.Stewart – Calculus ET 8e Chapter 8 Form F © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 9. Dye dilution is a method of measuring cardiac output. If A mg of dye is used and c(t) is the concentration of the dye at time t, then the cardiac output over the time interval [0, T ] is given by Find the cardiac output over the time interval [0, 15] if the dye dilution method is used with mg of dye and the dye concentration, in mg/L, is modeled by , where t is measured in seconds. 10. Find the area of the surface obtained by revolving the given curve about the x-axis. on ____ 11. Find the length of the curve. Select the correct answer. a. b. c. d. e. 12. Write an integral giving the area of the surface obtained by revolving the curve about the x-axis. (Do not evaluate the integral.) y = on [4, 6] 13. If the infinite curve , is rotated about the x-axis , find the area of the resulting surface.Stewart – Calculus ET 8e Chapter 8 Form F © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 14. Suppose the average waiting time for a customer's call to be answered by a company representative (modeled by exponentially decreasing probability density functions) is minutes. Find the median waiting time. Select the correct answer. a. minutes b. minutes c. minutes d. minutes e. minutes 15. You are given the shape of the vertical ends of a trough that is completely filled with water. Find the force exerted by the water on one end of the trough. (The weight density of water is 62.4 lb/ft3.) 5 ft 8 ft ____ 16. You are given the shape of the vertical ends of a trough that is completely filled with water. Find the force exerted by the water on one end of the trough. (The weight density of water is 62.4 lb/ft3.) Select the correct answer. 5 ft a. 5,200 lb b. 1,040 lb c. 520 lb d. 2,600 lb 17. Find the centroid of the region bounded by the graphs of the given equations.Stewart – Calculus ET 8e Chapter 8 Form F © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 18. A large tank is designed with ends in the shape of the region between the curves and , measured in feet. Find the hydrostatic force on one end of the tank if it is filled to a depth of ft with gasoline. (Assume that the density of the gasoline is 42.0 lb/ .) 19. A hot, wet summer is causing a mosquito population explosion in a lake resort area. The number of mosquitoes is increasing at an estimated rate of per week (where t is measured in weeks). By how much does the mosquito population increase between the 4th and th weeks of summer? ____ 20. The standard deviation for a random variable with probability density function f and mean µ is defined . Find the standard deviation for an exponential density function with mean . a. b. c. d. e.Stewart – Calculus ET 8e Chapter 8 Form F © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Stewart - Calculus 8e Chapter 8 Form F Answer Section 1. A 2. 13 13) 3. 0.6325 4. A 5. 285 2 6. 374 lb 7. 6.947582 8. B 9. 10. 11. B 12. 4 13. 14. C 15. 2,080 lb 16. A 17. 18. lb 19. 20. DStewart – Calculus ET 8e Chapter 8 Form G © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 1. Find the length of the curve. ____ 2. Find the length of the curve. Select the correct answer. a. b. c. d. e. None of these 3. Find the length of the curve for the interval . 4. Find the arc length of the graph of the given equation on the specified interval. y = 23 ( + 1) , [3, 4] 5. Set up, but do not evaluate, an integral for the area of the surface obtained by rotating the curve about the x-axis on the interval .Stewart – Calculus ET 8e Chapter 8 Form G © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 6. Find the area of the surface obtained by rotating the curve about the y-axis. Select the correct answer. a. b. c. d. e. None of these 7. Find the area of the surface obtained by rotating the circle about the line . 8. Find the area of the surface obtained by revolving the given curve about the x-axis. onStewart – Calculus ET 8e Chapter 8 Form G © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 9. If the infinite curve , is rotated about the x-axis , find the area of the resulting surface. Select the correct answer. a. b. c. d. e. 10. You are given the shape of the vertical ends of a trough that is completely filled with water. Find the force exerted by the water on one end of the trough. (The weight density of water is 62.4 lb/ft3.) 5 ft 4 ft ____ 11. A trough has vertical ends that are equilateral triangles with sides of length 4 ft. If the trough is filled with water to a depth of 1 ft, find the force exerted by the water on one end of the trough. Round to one decimal place. (The weight density of water is 62.4 lb/ft3.) Select the correct answer. a. 12.0 lb b. 249.6 lb c. 6.0 lb d. 499.2 lbStewart – Calculus ET 8e Chapter 8 Form G © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 12. The masses are located at the points . Find the moments and and the center of mass of the system. ; 13. A large tank is designed with ends in the shape of the region between the curves and , measured in feet. Find the hydrostatic force on one end of the tank if it is filled to a depth of ft with gasoline. (Assume that the density of the gasoline is 42.0 lb/ .) ____ 14. A trough is filled with a liquid of density 855 kg/ . The ends of the trough are equilateral triangles with sides m long and vertex at the bottom. Find the hydrostatic force on one end of the trough. Select the correct answer. a. b. c. d. e. ____ 15. Find the centroid of the region bounded by the given curves. Select the correct answer. a. b. c. d. e. 16. A vertical plate is submerged in water (the surface of the water coincides with the x-axis). Find the force exerted by the water on the plate. (The weight density of water is 62.4 lb/ft3.) (ft) 1 2 3 4 5 x 1 –1 –2 –3 –4 y (ft)Stewart – Calculus ET 8e Chapter 8 Form G © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 17. Use the Theorem of Pappus to find the volume of the solid obtained by revolving the region bounded by the graphs of and about the y-axis. Select the correct answer. a. 8 b. 32 3  c. 4 d. 16 3  18. The marginal cost function is defined to be the derivative of the cost function. If the marginal cost of manufacturing x units of a product is (measured in dollars per unit) and the fixed start-up cost is , use the Total Change Theorem to find the cost of producing the first 5,000 units. ____ 19. According to the National Health Survey, the heights of adult males in the United States are (normally distributed with mean) 73 inches, and standard deviation of 2.8 inches. What is the probability that an adult male chosen at random is between inches and inches tall? Select the correct answer. a. 0.5222 b. 0.7154 c. 0.6512 d. 0.5528 e. f. 0.2812 20. Suppose the average waiting time for a customer's call to be answered by a company representative (modeled by exponentially decreasing probability density functions) is minutes. Find the median waiting time.Stewart – Calculus ET 8e Chapter 8 Form G © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Answer Key 1. 2. E 3. 4. 77 3 5. 6. E 7. 8. 9. A 10. 1,040 lb 11. A 12. 13. lb 14. A 15. E 16. 1,872 lb 17. A 18. $ 19. E 20. minutesStewart - Calculus ET 8e Chapter 8 Form H © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 1. Find the length of the curve. Select the correct answer. a. b. c. d. e. None of these 2. Find the length of the curve for the interval . 3. Use Simpson’s Rule with n = 6 to estimate the length of the curve , . Round your answer to six decimal places. 4. Find the arc length of the graph of the given equation on the specified interval. y = 23 ( + 1) , [2, 5] 5. Set up, but do not evaluate, an integral for the length of the curve. 6. Find the area of the surface obtained by rotating the curve about the y-axis.Stewart - Calculus ET 8e Chapter 8 Form H © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 7. Write an integral giving the area of the surface obtained by revolving the curve about the x-axis. (Do not evaluate the integral.) y = on [3, 6] ____ 8. If the infinite curve , is rotated about the x-axis , find the area of the resulting surface. Select the correct answer. a. b. c. d. e. 9. You are given the shape of the vertical ends of a trough that is completely filled with water. Find the force exerted by the water on one end of the trough. (The weight density of water is 62.4 lb/ft3.) 5 ft 7 ft 10. A trough has vertical ends that are equilateral triangles with sides of length 7 ft. If the trough is filled with water to a depth of 4 ft, find the force exerted by the water on one end of the trough. Round to one decimal place. (The weight density of water is 62.4 lb/ft3.) 11. Find the centroid of the region bounded by the graphs of the given equations.Stewart - Calculus ET 8e Chapter 8 Form H © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. ____ 12. A large tank is designed with ends in the shape of the region between the curves and , measured in feet. Find the hydrostatic force on one end of the tank if it is filled to a depth of ft with gasoline. (Assume that the density of the gasoline is 42.0 lb/ .) Select the correct answer. a. 5,785 lb b. 4,850 lb c. 6,918 lb d. 2,683 lb e. lb f. 3,855 lb 13. A trough is filled with a liquid of density 855 kg/ . The ends of the trough are equilateral triangles with sides m long and vertex at the bottom. Find the hydrostatic force on one end of the trough. 14. Find the centroid of the region bounded by the given curves. ____ 15. Find the centroid of the region bounded by the given curves. Select the correct answer. a. b. c. d. e. 16. Find the centroid of the region bounded by the graphs of the given equations.Stewart - Calculus ET 8e Chapter 8 Form H © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. 17. Dye dilution is a method of measuring cardiac output. If A mg of dye is used and c(t) is the concentration of the dye at time t, then the cardiac output over the time interval [0, T ] is given by Find the cardiac output over the time interval [0, 15] if the dye dilution method is used with mg of dye and the dye concentration, in mg/L, is modeled by , where t is measured in seconds. ____ 18. The marginal revenue from producing x units of a certain product is (in dollars per unit). Find the increase in revenue if the production level is raised from 1,100 units to units. Select the correct answer. a. $37,974,583 b. $51,367,000 c. $26,866,667 d. $17,765,250 e. $ 19. According to the National Health Survey, the heights of adult males in the United States are (normally distributed with mean) 73 inches, and standard deviation of 2.8 inches. What is the probability that an adult male chosen at random is between inches and inches tall? ____ 20. The manager of a fast-food restaurant determines that the average time that her customers wait for service is 2 minutes. Find the probability that a customer is served within the first minutes. Select the correct answer. a. b. c. d. e.Stewart - Calculus ET 8e Chapter 8 Form H © 2016 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part. Answer Key 1. E 2. 3. 6.947582 4. 81 5. 6. None of these 7. 8 8. A 9. 1,820 lb 10. 768.6 lb 11. 12. E 13. 14. 28 75, 92 105 15. C 16. 17. 18. E 19. 20. B [Show More]

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