A dam is inclined at an angle of 30° from the vertical and has the shape of an isosceles trapezoid 100 ft wide at the top and 50 ft wide at the bottom and with a slant height of 70 ft. Find the hydrostatic force on the dam when it is full of water.
> The given curve is rotated about the y axis. Find the area of the resulting surface. x2/3 + y/3 = 1, 0< y<1 %3|
> The given curve is rotated about the y­ axis. Find the area of the resulting surface. y = }x2, 0 <x< 12
> Find the exact area of the surface obtained by rotating the curve about the x axis. x = 1 + 2y?, 1 <y<2
> Find the exact area of the surface obtained by rotating the curve about the x axis. x = }(y² + 2)/², 1<y<2 + 2)/2, ミys2
> Find the exact area of the surface obtained by rotating the curve about the x axis. y = 6. 2x
> Find the exact area of the surface obtained by rotating the curve about the x axis. y = cos(}x), 0<x<T
> Find the exact area of the surface obtained by rotating the curve about the x axis. y = V1 + e*, 0<x<1
> Find the exact area of the surface obtained by rotating the curve about the x axis. y² = x + 1, 0<x< 3
> Find the exact area of the surface obtained by rotating the curve about the x axis. у3 V5 — х, 3<x<5
> Find the exact area of the surface obtained by rotating the curve about the x­ axis. y = x', 0< x < 2
> (a) Set up an integral for the area of the surface obtained by rotating the curve about (i) the x axis and (ii) the y axis. (b) Use the numerical integration capability of a calculator to evaluate the surface areas correct to four decimal places. у —
> (a) Set up an integral for the area of the surface obtained by rotating the curve about (i) the x axis and (ii) the y axis. (b) Use the numerical integration capability of a calculator to evaluate the surface areas correct to four decimal places. x =
> (a) Set up an integral for the area of the surface obtained by rotating the curve about (i) the x axis and (ii) the y axis. (b) Use the numerical integration capability of a calculator to evaluate the surface areas correct to four decimal places. x =
> (a) Set up an integral for the area of the surface obtained by rotating the curve about (i) the x axis and (ii) the y axis. (b) Use the numerical integration capability of a calculator to evaluate the surface areas correct to four decimal places. y =
> (a) Set up an integral for the area of the surface obtained by rotating the curve about (i) the x axis and (ii) the y axis. (b) Use the numerical integration capability of a calculator to evaluate the surface areas correct to four decimal places. y =
> (a) Set up an integral for the area of the surface obtained by rotating the curve about (i) the x­ axis and (ii) the y­ axis. (b) Use the numerical integration capability of a calculator to evaluate the surface areas correct to four
> Evaluate the integral using integration by parts with the indicated choices of u and dv. хе ^ dx; и —х, dv — — х, do — e 2* dx
> Let 5 be the region that lies between the curves where m and n are integers with 0 (a) Sketch the region /. (b) Find the coordinates of the centroid of /. (c) Try to find values of m and n such that the centroid lies outside /. y = x" y = x" 0 < x< 1
> Use the Second Theorem of Pappus described in Exercise 48 to find the surface area of the torus in Example 7.
> The Second Theorem of Pappus is in the same spirit as Pappus’s Theorem on page 565, but for surface area rather than volume: Let C be a curve that lies entirely on one side of a line l in the plane. If C is rotated about l, then the area of the resulting
> The centroid of a curve can be found by a process similar to the one we used for finding the centroid of a region. If C is a curve with length L, then the centroid is (x, y) where / Here we assign appropriate limits of integration, and ds is as defined i
> Use the Theorem of Pappus to find the volume of the given solid. The solid obtained by rotating the triangle with vertices (2, 3), (2, 5), and (5, 4) about the x-axis
> Use the Theorem of Pappus to find the volume of the given solid. A cone with height h and base radius r
> Use the Theorem of Pappus to find the volume of the given solid. A sphere of radius r
> If x is the x-coordinate of the centroid of the region that lies under the graph of a continuous function f, where a (ex + d)f(x) dx = (cã + d) [* f(x) dx %3D
> A rectangle R with sides a and b is divided into two parts R1 and R2 by an arc of a parabola that has its vertex at one corner of R and passes through the opposite corner. Find the centroids of both R1and R2. R2 Ry
> 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. -2 i 2 X -1 2.
> 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. yA 2 1- -1 1 2.
> Prove that the centroid of any triangle is located at the point of intersection of the medians.
> Use a graph to find approximate x-coordinates of the points of intersection of the curves y = ex and y = 2 - x2. Then find (approximately) the centroid of the region bounded by these curves.
> Find the centroid of the region bounded by the curves y = x3 - x and y = x2 - 1. Sketch the region and plot the centroid to see if your answer is reasonable.
> Use Simpson’s Rule to estimate the centroid of the region shown. y 4 4 8 x 2. 2.
> Calculate the moments Mx and My and the center of mass of a lamina with the given density and shape. p= 6 y 4 -2
> Calculate the moments Mx and My and the center of mass of a lamina with the given density and shape. - p = 4 yA 3 2
> Find the centroid of the region bounded by the given curves. х+у—2, х — у? 2, х— у
> Find the centroid of the region bounded by the given curves. y = x', x + y = 2, y= 0
> Find the centroid of the region bounded by the given curves. у — sin x, у — сos x, х — 0, х— п/4 TT
> Find the centroid of the region bounded by the given curves. у — 2 — х*, у — х
> A function f is defined by that is, its coefficients are c2n = 1 and c2n+1 = 2 for all n > 0. Find the interval of convergence of the series and find an explicit formula for f(x). f(x) = 1 + 2x + x² + 2x³ + x* + . ||
> Find the centroid of the region bounded by the given curves. y у —х, х— у? x², x=y*
> Sketch the region bounded by the curves, and visually estimate the location of the centroid. Then find the exact coordinates of the centroid. y = sin x, y = 0, 0<x<T
> Sketch the region bounded by the curves, and visually estimate the location of the centroid. Then find the exact coordinates of the centroid. у —е", у—0, х— 0, х— 1
> Sketch the region bounded by the curves, and visually estimate the location of the centroid. Then find the exact coordinates of the centroid. y = Vx, y=0, x= 4 X = 4
> Sketch the region bounded by the curves, and visually estimate the location of the centroid. Then find the exact coordinates of the centroid. у — 2х, у— 0, х— 1 y
> The masses mi are located at the points Pi. Find the moments Mx and My and the center of mass of the system. т — 5, т, — 4, тз — 3, т, — 6; P.(-4, 2), Р.0, 5), Р:(3, 2), Р.(1, —2)
> The masses mi are located at the points Pi. Find the moments Mx and My and the center of mass of the system. т, — 4, тз — 2, тз — 4; P (2, — 3), Р.(-3, 1), P:(3, 5)
> The function A defined by is called an Airy function after the English mathematician and astronomer Sir George Airy (1801–1892). (a) Find the domain of the Airy function. (b) Graph the first several partial sums on a common screen. (c)
> A metal plate was found submerged vertically in seawater, which has density 64 lb/ft3. Measurements of the width of the plate were taken at the indicated depths. Use Simpson’s Rule to estimate the force of the water against the plate.
> A swimming pool is 20 ft wide and 40 ft long and its bottom is an inclined plane, the shallow end having a depth of 3 ft and the deep end, 9 ft. If the pool is full of water, find the hydro static force on (a) the shallow end, (b) the deep end, (c) one o
> A cube with 20-cm-long sides is sitting on the bottom of an aquarium in which the water is one meter deep. Find the hydrostatic force on (a) the top of the cube and (b) one of the sides of the cube.
> A vertical dam has a semicircular gate as shown in the figure. Find the hydrostatic force against the gate. ]} 2 m `water level 12 m 4 m
> A trough is filled with a liquid of density 840 kg/m3. The ends of the trough are equilateral triangles with sides 8 m long and vertex at the bottom. Find the hydrostatic force on one end of the trough.
> A milk truck carries milk with density 64.6 lb/ft3 in a horizontal cylindrical tank with diameter 6 ft. (a) Find the force exerted by the milk on one end of the tank when the tank is full. (b) What if the tank is half full?
> A vertical plate is submerged (or partially submerged) in water and has the indicated shape. Explain how to approximate the hydrostatic force against one side of the plate by a Riemann sum. Then express the force as an integral and evaluate it. 2а h
> A vertical plate is submerged (or partially submerged) in water and has the indicated shape. Explain how to approximate the hydrostatic force against one side of the plate by a Riemann sum. Then express the force as an integral and evaluate it. a a
> The function J1 defined by is called the Bessel function of order 1. (a) Find its domain. (b) Graph the first several partial sums on a common screen. (c) If your CAS has built-in Bessel functions, graph J1 on the same screen as the partial sums in part
> (a) Approximate f by a Taylor polynomial with degree n at the number a. (b) Use Taylor’s Inequality to estimate the accuracy of the approximation / when x lies in the given interval. (c) Check your result in part (b) by graphing / S
> A vertical plate is submerged (or partially submerged) in water and has the indicated shape. Explain how to approximate the hydrostatic force against one side of the plate by a Riemann sum. Then express the force as an integral and evaluate it. 4 ft
> A vertical plate is submerged (or partially submerged) in water and has the indicated shape. Explain how to approximate the hydrostatic force against one side of the plate by a Riemann sum. Then express the force as an integral and evaluate it. 4 m
> A vertical plate is submerged (or partially submerged) in water and has the indicated shape. Explain how to approximate the hydrostatic force against one side of the plate by a Riemann sum. Then express the force as an integral and evaluate it. -2 m
> A vertical plate is submerged (or partially submerged) in water and has the indicated shape. Explain how to approximate the hydrostatic force against one side of the plate by a Riemann sum. Then express the force as an integral and evaluate it. 4 m
> A vertical plate is submerged (or partially submerged) in water and has the indicated shape. Explain how to approximate the hydrostatic force against one side of the plate by a Riemann sum. Then express the force as an integral and evaluate it. 1 4
> A vertical plate is submerged (or partially submerged) in water and has the indicated shape. Explain how to approximate the hydrostatic force against one side of the plate by a Riemann sum. Then express the force as an integral and evaluate it. 2 ft
> A vertical plate is submerged (or partially submerged) in water and has the indicated shape. Explain how to approximate the hydrostatic force against one side of the plate by a Riemann sum. Then express the force as an integral and evaluate it. 3 ft
> A tank is 8 m long, 4 m wide, 2 m high, and contains kerosene with density 820 kg/m3 to a depth of 1.5 m. Find (a) the hydrostatic pressure on the bottom of the tank, (b) the hydrostatic force on the bottom, and (c) the hydrostatic force on one end of th
> An aquarium 5 ft long, 2 ft wide, and 3 ft deep is full of water. Find (a) the hydrostatic pressure on the bottom of the aquarium, (b) the hydrostatic force on the bottom, and (c) the hydrostatic force on one end of the aquarium.
> The graph of the concentration function c(t) is shown after a 7-mg injection of dye into a heart. Use Simpson’s Rule to estimate the cardiac output. (mg/L) 4 0 2 4 6 8 10 12 14 í(seconds) 2.
> After a 5.5-mg injection of dye, the readings of dye concentration, in mg/L, at two-second intervals are as shown in the table. Use Simpson’s Rule to estimate the cardiac output. t c(t) t c(1) 0.0 10 4.3 2 4.1 12 2.5 4 8.9 14 1.2 8
> The dye dilution method is used to measure cardiac output with 6 mg of dye. The dye concentrations, in mg/L, are modeled by / where t is measured in seconds. Find the cardiac output.
> High blood pressure results from constriction of the arteries. To maintain a normal flow rate (flux), the heart has to pump harder, thus increasing the blood pressure. Use Poiseuille’s Law to show that if R0 and P0 are normal values of
> 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 2200 + 10e0.8t per week (where t is measured in weeks). By how much does the mosquito population increase b
> Pareto’s Law of Income states that the number of people with incomes between / where A and k are constants with A > 0 and k > 1. The average income of these people is Calculate x. x - a and x = b is N – L Ax * dx, ·
> The present value of an income stream is the amount that would need to be invested now to match the future value as described in Exercise 15 and is given by / Find the present value of the income stream in Exercise 15. Data from Exercise 15: If income
> If income is continuously collected at a rate of f(t) dollars per year and will be invested at a constant interest rate r (compounded continuously) for a period of T years, then the future value of the income is given by / Compute the future value after
> A movie theater has been charging $10.00 per person and selling about 500 tickets on a typical weeknight. After surveying their customers, the theater management estimates that for every 50 cents that they lower the price, the number of movie goers will
> A company modeled the demand curve for its product (in dollars) by the equation Use a graph to estimate the sales level when the selling price is $16. Then find (approximately) the consumer surplus for this sales level. 800,000e/S000 p = x + 20,000
> Is it possible to find a power series whose interval of convergence is [0,∞]? Explain.
> A camera company estimates that the demand function for its new digital camera is p(x) = 312e0.14x and the supply function is estimated to be pS(x) = 26e0.2x, where x is measured in thousands. Compute the maximum total surplus.
> The sum of consumer surplus and producer surplus is called the total surplus; it is one measure economists use as an indicator of the economic health of a society. Total surplus is maximized when the market for a good is in equilibrium. (a) The demand fu
> In a purely competitive market, the price of a good is naturally driven to the value where the quantity demanded by consumers matches the quantity made by producers, and the market is said to be in equilibrium. These values are the coordinates of the poi
> If a supply curve is modeled by the equation p = 125 + 0.002x2, find the producer surplus when the selling price is $625.
> The supply function pS(x) for a commodity gives the relation between the selling price and the number of units that manufacturers will produce at that price. For a higher price, manufacturers will produce more units, so pS is an increasing function of x.
> A demand curve is given by p = 450/(x + 8). Find the consumer surplus when the selling price is $10.
> A mining company estimates that the marginal cost of extracting x tons of copper ore from a mine is 0.6 + 0.008x, measured in thousands of dollars per ton. Start-up costs are $100,000. What is the cost of extracting the first 50 tons of copper? What abou
> A company estimates that the marginal revenue (in dollars per unit) realized by selling x units of a product is 48 - 0.0012x. Assuming the estimate is accurate, find the increase in revenue if sales increase from 5000 units to 10,000 units.
> The marginal cost function C9sxd was defined to be the derivative of the cost function. The marginal cost of producing x gallons of orange juice is (measured in dollars per gallon). The fixed start-up cost is C(0) = $18,000. Use the Net Change Theorem to
> Let p and q be real numbers with p (а) (р, q) (b) (р, q] (c) [р, 9) (d) [р, q]
> The hydrogen atom is composed of one proton in the nucleus and one electron, which moves about the nucleus. In the quantum theory of atomic structure, it is assumed that the electron does not move in a well-defined orbit. Instead, it occupies a state kno
> For any normal distribution, find the probability that the random variable lies within two standard deviations of the mean.
> Show that the probability density function for a normally distributed random variable has inflection points at /
> The speeds of vehicles on a highway with speed limit 100 km/h are normally distributed with mean 112 km/h and standard deviation 8 km/h. (a) What is the probability that a randomly chosen vehicle is traveling at a legal speed? (b) If police are instructe
> 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. (a) If the target weight is 500 g, what is the probability that the machine produces a box with le
> The “Garbage Project” at the University of Arizona reports that the amount of paper discarded by households per week is normally distributed with mean 9.4 lb and standard deviation 4.2 lb. What percentage of households throw out at least 10 lb of paper a
> According to the National Health Survey, the heights of adult males in the United States are normally distributed with mean 69.0 inches and standard deviation 2.8 inches. (a) What is the probability that an adult male chosen at random is between 65 inche
> REM sleep is the phase of sleep when most active dreaming occurs. In a study, the amount of REM sleep during the first four hours of sleep was described by a random variable T with probability density function where t is measured in minutes. (a) What is
> The time between infection and the display of symptoms for streptococcal sore throat is a random variable whose probabililty density function can be approximated by / otherwise (t measured in hours). (a) What is the probability that an infected patient
> If k is a positive integer, find the radius of convergence of the series (n!)* Σ (kn)! R-0
> An online retailer has determined that the average time for credit card transactions to be electronically approved is 1.6 seconds. (a) Use an exponential density function to find the probability that a customer waits less than a second for credit card ap
> Show that the median waiting time for a phone call to the company described in Example 4 is about 3.5 minutes.
> (a) Explain why the function whose graph is shown is a probability density function. (b) Use the graph to find the following probabilities: (i) P(X (ii) P(3 (c) Calculate the mean. y. 0.2 y= f(x) 0.1 2 4 8 10
