Repeat Problem 81 if the monthly rate of increase in sales is found to be approximated by S′(t) = 20 - 20e-0.05t 0 ≤ t ≤ 24 Data from Problem 81: (A) What will be the total sales S1t2 t months after the beginning of the national campaign if we assume no sales at the beginning of the campaign? (B) What are the estimated total sales for the first 12 months of the campaign? (C) When will the estimated total sales reach $100 million? Use a graphing calculator to approximate the answer to two decimal places.
> Refer to Problem 75. Explain why the world population function Q(t) does not satisfy an exponential growth law. Data from Problem 75: Let Q(t) denote the population of the world at time t. In 1999, the world population was 6.0 billion and increasing at
> Use the limiting matrix P found for each transition matrix P in Problems 29–34 to determine the long-run behavior of the successive state matrices for the indicated initial-state matrices
> Find the value of t for which the logistic function is equal to M/2.
> use a graphing calculator to graph the given examples of the various cases in Table 1.
> use a graphing calculator to graph the given examples of the various cases in Table 1.
> use a graphing calculator to graph the given examples of the various cases in Table 1.
> use a graphing calculator to graph the given examples of the various cases in Table 1.
> Show that y = 2/ (1 + ce-6t) is a solution of the differential equation dy/dt = 3y(2 – y) for any real number c. Find the particular solution that passes through (0, 1).
> Show that y = C/x is a solution of the differential equation dy/dx = -y/x for any real number C. Find the particular solution that passes through (2, 5).
> Show that y = √x2 + C is a solution of the differential equation dy/dx = x/y for any real number C. Find the particular solution that passes through (-6, 7).
> Refer to the following slope fields: Use a graphing calculator to graph y = Cex - 1 for C = -2, -1, 1, and 2, for -5 ≤ x ≤ 5, -5 ≤ y ≤ 5, all in the same viewing window. Obse
> Refer to the following slope fields: Graph the particular solution found in Problem 54 in the appropriate Figure A or B (or a copy).
> Use the limiting matrix P found for each transition matrix P in Problems 29–34 to determine the long-run behavior of the successive state matrices for the indicated initial-state matrices
> Refer to the following slope fields: Show that y = Ce x- 1 is a solution of the differential equation dy/dx = y + 1 for any real number C. Find the particular solution that passes through (0, 0).
> Refer to the following slope fields: Which slope field is associated with the differential equation dy/dx = y + 1? Briefly justify your answer.
> does the given differential equation model unlimited growth, exponential decay, limited growth, or logistic growth? y(= 10,000 - y
> does the given differential equation model unlimited growth, exponential decay, limited growth, or logistic growth? y(= -0.0152y
> Find the general or particular solution, as indicated, for each differential equation.
> Find the general or particular solution, as indicated, for each differential equation.
> Find the general or particular solution, as indicated, for each differential equation.
> Find the general or particular solution, as indicated, for each differential equation.
> Refer to the following slope fields: Graph the particular solution found in Problem 36 in the appropriate Figure A or B (or a copy).
> Refer to the following slope fields: Solve the differential equation dy/dx = -x and find the particular solution that passes through (0, 3).
> Use the limiting matrix P found for each transition matrix P in Problems 29–34 to determine the long-run behavior of the successive state matrices for the indicated initial-state matrices
> Refer to the following slope fields: Which slope field is associated with the differential equation dy/dx = -x? Briefly justify your answer.
> Is y = e-3x a solution of the differential equation y( - 4y( + 3y = 0? Explain.
> Is y = -2ex a solution of the differential equation y’’ - 4y= + 3y = 0? Explain.
> Is y = 5ex2/2 a solution of the differential equation y’= xy? Explain.
> Is y = 8x + 8 a solution of the differential equation
> Give the order (first, second, third, etc.) of each differential equation, where y represents a function of the variable.
> Give the order (first, second, third, etc.) of each differential equation, where y represents a function of the variable.
> Find the general or particular solution, as indicated, for each first-order differential equation.
> Find the general or particular solution, as indicated, for each first-order differential equation.
> Find the general or particular solution, as indicated, for each first-order differential equation.
> find the limiting matrix for the indicated standard form. Find the long-run probability of going from each nonabsorbing state to each absorbing state and the average number of trials needed to go from each nonabsorbing state to an absorbing state.
> The function x(t) in Problem 95 exhibits logistic growth. Why might the rate at which a rumor spreads initially increase, but eventually slow down? Data from Problem 95:
> Find the general or particular solution, as indicated, for each first-order differential equation.
> A college language class was chosen for an experiment in learning. Using a list of 50 words, the experiment involved measuring the rate of vocabulary memorization at different times during a continuous 5-hour study session. It was found that the average
> Find the general or particular solution, as indicated, for each first-order differential equation.
> The area A of a healing wound changes at a rate given approximately by where t is time in days and A(1) = 2 square centimeters. What will the area of the wound be in 10 days?
> An average student enrolled in a steno typing class progressed at a rate of N′(t) = 12e-0.06t words per minute per week t weeks after enrolling in a 15-week course. If, at the beginning of the course, a student could stenotype at zero words per minute,
> If the rate of labor use in Problem 89 is L′(x) = 2,000x-1/3 and if the first 8 control units require 12,000 labor-hours, how many labor-hours, L(x), will be required for the first x control units? The first 27 control units?
> An oil tanker aground on a reef is losing oil and producing an oil slick that is radiating outward at a rate given approximately by where R is the radius (in feet) of the circular slick after t minutes. Find the radius of the slick after 16 minutes if
> Repeat Problem 86 if S′(t) = 500t1/4 + 300 and all other information remains the same. Use a graphing calculator to approximate the solution of the equation S(t)= 20,000 to two decimal places. Data from Problem 86: The rate of change of the monthly sale
> The rate of healing for a skin wound (in square centimeters per day) is approximated by A′(t) = -0.9e-0.1t If the initial wound has an area of 7 square centimeters, what will its area A(t) be after t days? After 5 days?
> find the limiting matrix for the indicated standard form. Find the long-run probability of going from each nonabsorbing state to each absorbing state and the average number of trials needed to go from each nonabsorbing state to an absorbing state.
> The rate of change of the monthly sales of a newly released football game is given by S′(t) = 500t 1/4 S(0) = 0 where t is the number of months since the game was released and S(t) is the number of games sold each month. Find S(t). When will monthly
> Assume that the rate in Problem 83 is found to be (A) When is the rate of production greatest? (B) How many barrels of oil Q1t2 will the field produce in the first t years if Q102 = 0? How many barrels will be produced in the first 5 years? (C) How l
> The graph of the marginal revenue function from the sale of x smart watches is given in the figure. (A) Using the graph shown, describe the shape of the graph of the revenue function R(x) as x increases from 0 to 1,000. (B) Find the equation of the marg
> In 2016, U.S. consumption of renewable energy was 9.97 quadrillion Btu (or 9.97 * 1015 Btu). Since the 1950s, consumption has been growing at a rate (in quadrillion Btu per year) given by ′(t) = 0.002t + 0.03 where t is years after 1950. Find (t) and
> The weekly marginal revenue from the sale of x pairs of tennis shoes is given by where R(x) is revenue in dollars. Find the revenue function. Find the revenue from the sale of 1,000 pairs of shoes.
> Show that the indefinite integral of the difference of two functions is the difference of the indefinite integrals.
> The marginal price at a supply level of x bottles of laundry detergent per week is given by Find the price–supply equation if the distributor of the detergent is willing to supply 75 bottles a week at a price of $5.00 per bottle. How m
> Assuming that x [Hint: Use the chain rule after noting that ln |x| = ln ( -x) for x 6 0.]
> Find the family of all antiderivatives of each derivative.
> find the limiting matrix for the indicated standard form. Find the long-run probability of going from each nonabsorbing state to each absorbing state and the average number of trials needed to go from each nonabsorbing state to an absorbing state.
> Use differentiation to justify the formula
> Find the family of all antiderivatives of each derivative.
> find the derivative or indefinite integral as indicated.
> Find the family of all antiderivatives of each derivative.
> find the derivative or indefinite integral as indicated.
> Find each indefinite integral and check the result by differentiating.
> find each indefinite integral
> Find each indefinite integral and check the result by differentiating.
> find each indefinite integral
> Find each indefinite integral and check the result by differentiating.
> find a standard form for the absorbing Markov chain with the indicated transition matrix.
> identify the absorbing states for each transition diagram, and determine whether or not the diagram represents an absorbing Markov chain.
> You want to lift a heavy box with a mass of 98.0 kg using the two- ideal-pulley system as shown. With what minimum force do you have to pull down on the rope in order to lift the box at a constant velocity? One pulley is attached to the ceiling and one t
> A boy has stacked two blocks on the floor so that a 5.00 kg block is on top of a 2.00 kg block. (a) If the coefficient of static friction between the two blocks is 0.400 and the coefficient of static friction between the bottom block and the floor is 0.
> (a) If a spacecraft moves in a straight line between Earth and the Sun, at what point would the force of gravity on the spacecraft due to the Sun be as large as that due to Earth? (b) If the spacecraft is close to, but not at, this equilibrium point, do
> A student's head is bent over her physics book. The head weighs 50.0 N and is supported by the muscle force //
> A large wrecking ball of mass m is resting against a wall. It hangs from the end of a cable that is attached at its upper end to a crane that is just touching the wall. The cable makes an angle of θ with the wall. Ignoring friction between t
> Two canal workers pull a barge along the narrow waterway at a constant speed. One worker pulls with a force of 105 N at an angle of 28° with respect to the forward motion of the barge, and the other worker, on the opposite tow path, pulls at an angle of
> By what percentage does the weight of an object change when it is moved from the equator at sea level, where the effective value of g is 9.784 N/kg, to the North Pole where g = 9.832 N/kg?
> The tallest spot on Earth is Mt. Everest, which is 8850 m above sea level. If the radius of Earth to sea level is 6370 km, how much does the gravitational field strength change between the sea level value at that location (9.826 N/kg) and the top of Mt.
> Spring scale A is attached to the ceiling. A 10.0 kg object is suspended from the scale. A second spring scale, B, is hanging from a hook at the bottom of the 10.0 kg object and a 4.0 kg object hangs from the second spring scale. (a) What are the readin
> A 50.0 kg crate is suspended between the floor and the ceiling using two spring scales, one attached to the ceiling and one to the floor. If the lower scale reads 120 N, what is the reading of the upper scale? Ignore the weights of the scales.
> Rank vectors /
> In the sport of curling, a player slides a 20.0 kg granite stone down a 38 m long ice rink. Draw FBDs for the stone (a) while it sits at rest on the ice; (b) while it slides down the rink; (c) during a head-on collision with an opponent's stone that w
> Four identical spring scales, A, B, C, and D are used to hang a 220.0 N sack of potatoes. (a) Assume that the scales have negligible weights and that all four scales show the same reading. What is the reading of each scale? (b) Suppose that each scale
> A box full of books rests on a wooden floor. The normal force the floor exerts on the box is 250 N. (a) You push horizontally on the box with a force of 120 N, but it refuses to budge. What can you say about the coefficient of static friction between th
> The coefficient of static friction between a block and a horizontal floor is 0.40, while the coefficient of kinetic friction is 0.15. The mass of the block is 5.0 kg. A horizontal force is applied to the block and slowly increased. (a) What is the value
> A toy freight train consists of an engine and three identical cars. The train is moving to the right at constant speed along a straight, level track. Three spring scales are used to connect the cars as follows: spring scale A is located between the engin
> The figure shows the quadriceps and the patellar tendons attached to the patella (the kneecap). If the tension T in each tendon is 1.30 kN, what are the magnitude and direction of the contact /
> A person is doing leg lifts with 3.00 kg ankle weights. The lower leg itself has a mass of 5.00 kg. When the leg is held still at an angle of 30.0° with respect to the horizontal, the patellar tendon pulls on the tibia with a force of 337 N at
> A young boy with a broken leg is undergoing traction. (a) Find the magnitude of the total force of the traction apparatus applied to the leg, assuming the weight of the leg is 22 N and the weight hanging from the traction apparatus is also 22 N. (b) Wh
> An airplane is cruising along in a horizontal level flight at a constant velocity, heading due west. (a) If the weight of the plane is 2.6 × 104 N, what is the net force on the plane? (b) With what force does the air push upward on the plane?
> A roller coaster car is towed up an incline at a steady speed of 0.50 m/s by a chain parallel to the surface of the incline. The slope is 3.0%, which means that the elevation increases by 3.0 m for every 100.0 m of horizontal distance. The mass of the ro
> A force of 20 N is directed at an angle of 60° above the x-axis. A second force of 20 N is directed at an angle of 60° below the x-axis. What is the vector sum of these two forces?
> You want to push a 65 kg box up a 25° ramp. The coefficient of kinetic friction between the ramp and the box is 0.30. With what magnitude force parallel to the ramp should you push on the box so that it moves up the ramp at a constant speed?
> A tire swing hangs at a constant 12° angle to the vertical when a stiff breeze is blowing. In terms of the tire's weight W, (a) what is the magnitude of the horizontal force exerted on the tire by the wind? (b) What is the tension in the rope supportin
> Tamar wants to cut down a dead poplar tree with her chain saw, but she does not want it to fall onto the nearby gazebo. Yoojin, a physicist, suggests they tie a rope taut from the poplar to an oak tree and then pull sideways on the rope as shown in the f
> While trying to decide where to hang a framed picture, you press it against the wall to keep it from falling. The picture weighs 5.0 N, and you press against the flat frame with a force of 6.0 N at an angle of 40° from the vertical. (a) What
> The coefficient of static friction between block A and a horizontal floor is 0.45, and the coefficient of static friction between block B and the floor is 0.30. The mass of each block is 2.0 kg, and they are connected together by a cord. / (b) What is t
> When you hold up a 50 N object in your hand, with your forearm horizontal and your palm up, the upward force exerted by your biceps is much larger than 50 N—perhaps as much as 5000 N. How can that be? What other forces are acting on you
> You grab a book and give it a quick push across the top of a horizontal table. After a short push, the book slides across the table, and because of friction, comes to a stop. (a) Draw an FBD of the book while you are pushing it. (b) Draw an FBD of the
> You want to hang a 15 N picture as in the figure (a) using some very fine twine that will break with more than 12 N of tension. Can you do this? What if you have it as illustrated in Figure (b)?
> A box containing a new TV weighs 350 N. Phineas is pushing horizontally on it with a force of 150 N, but it doesn't budge. (a) Identify all the forces acting on the crate. Describe each as: (type of force) exerted on the crate by (object). (b) Identify
> A bike is hanging from a hook in a garage. Consider the following forces: (1) the force of Earth pulling down on the bike, (2) the force of the bike pulling up on Earth, and (3) the force of the hook pulling up on the bike. (a) Which two forces are e
