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mathematics
precalculus

Questions and Answers of Precalculus

Match the function (a) with its graph (labeled A–F below) and (b) with its contour map (labeled I–VI). Give reasons for your choices.z = sin(xy) B D II III IV VI
Use a computer to graph the function using various domains and viewpoints. Get a printout of one that, in your opinion, gives a good view. If your software also produces level curves, then plot some
Use a computer to graph the function using various domains and viewpoints. Get a printout of one that, in your opinion, gives a good view. If your software also produces level curves, then plot some
Use a computer to graph the function using various domains and viewpoints. Get a printout of one that, in your opinion, gives a good view. If your software also produces level curves, then plot some
Use a computer to graph the function using various domains and viewpoints. Get a printout of one that, in your opinion, gives a good view. If your software also produces level curves, then plot some
If V(x, y) is the electric potential at a point (x, y) in the xy-plane, then the level curves of V are called equipotential curves because at all points on such a curve the electric potential is the
A thin metal plate, located in the xy-plane, has temperature T(x, y) at the point (x, y). Sketch some level curves (isothermals) if the temperature function is given byT(x, y) = 100/1 + x2 + 2y2
Sketch both a contour map and a graph of the function and compare them.f (x, y) = √36 - 9x2 - 4y2
Sketch both a contour map and a graph of the function and compare them.f (x, y) = x2 + 9y2
Draw a contour map of the function showing several level curves.f (x, y) = y/(x2 + y2)
Draw a contour map of the function showing several level curves.f (x, y) = 3√x2 + y2
Draw a contour map of the function showing several level curves.f (x, y) = y - arctan x
Draw a contour map of the function showing several level curves.f (x, y) = yex
Draw a contour map of the function showing several level curves.f (x, y) = ln(x2 + 4y2)
Draw a contour map of the function showing several level curves.f (x, y) = √x + y
Draw a contour map of the function showing several level curves.f (x, y) = xy
Draw a contour map of the function showing several level curves.f (x, y) = x2 - y2
A contour map of a function is shown. Use it to make a rough sketch of the graph of f . Ул х
A contour map of a function is shown. Use it to make a rough sketch of the graph of f . 4 10 4 х 2.
A contour map of a function is shown. Use it to make a rough sketch of the graph of f . yA -9- 8.
A contour map of a function is shown. Use it to make a rough sketch of the graph of f . ул 14 13 12 х
The body mass index is defined in Exercise 39. Draw the level curve of this function corresponding to someone who is 200 cm tall and weighs 80 kg. Find the weights and heights of two other people
The body mass index (BMI) of a person is defined by B(m, h) = m/h2 where m is the person’s mass (in kilograms) and h is the height (in meters). Draw the level curves B(m, h) = 18.5, B(m, h) = 25,
Make a rough sketch of a contour map for the function whose graph is shown. ZA х
Locate the points A and B on the map of Lonesome Mountain (Figure 12). How would you describe the terrain near A? Near B?
Two contour maps are shown. One is for a function f whose graph is a cone. The other is for a function g whose graph is a paraboloid. Which is which, and why? I II
Level curves (isothermals) are shown for the typical water temperature sin 8Cd in Long Lake (Minnesota) as a function of depth and time of year. Estimate the temperature in the lake on June 9 (day
Shown is a contour map of atmospheric pressure in North America on August 12, 2008. On the level curves (called isobars) the pressure is indicated in millibars (mb).(a) Estimate the pressure at C
A contour map for a function f is shown. Use it to estimate the values of f (-3, 3) and f (3, -2). What can you say about the shape of the graph? 70 60 50 40 30 20 10:
Sketch the graph of the function.f (x, y) = √4 - 4x2 - y2
Sketch the graph of the function.f (x, y) = √4x2 + y2
Sketch the graph of the function.f (x, y) = x2 + 4y2 + 1
Sketch the graph of the function.f (x, y) = 2 - x2 - y2
Sketch the graph of the function.f (x, y) = sin x
Sketch the graph of the function.f (x, y) = cos y
Sketch the graph of the function.f (x, y) = 10 - 4x - 5y
Sketch the graph of the function.f (x, y) = x2
Sketch the graph of the function.f (x, y) = y
Find and sketch the domain of the function.f (x, y, z) = ln(16 - 4x2 - 4y2 - z2)
Find and sketch the domain of the function.f (x, y, z) = √4 - x2 + √9 - y2 + √1 - z2
Find and sketch the domain of the function.f (x, y) = sin-1(x + y)
Find and sketch the domain of the function.f (x, y) = √y - x2/1 - x2
Find and sketch the domain of the function.g(x, y) = ln(2 - x)/1 - x2 - y2
Find and sketch the domain of the function.t(x, y) = x - y/x + y
Find and sketch the domain of the function.f (x, y) = √x2 + y2 - 4
Find and sketch the domain of the function.f (x, y) = ln(9 - x2 - 9y2)
Find and sketch the domain of the function.f (x, y) = 4√x - 3y
Find and sketch the domain of the function.f(x, y) = √x - 2 + √y - 1
Let g(x, y, z) = x3y2z √10 - x - y - z .(a) Evaluate g(1, 2, 3).(b) Find and describe the domain of g.
Let f(x, y, z) = (x + √y + √z + ln(4 - x2 - y2 - z2).(a) Evaluate f (1, 1, 1).(b) Find and describe the domain of f.
Let F(x, y) = 1 + √4 - y2.(a) Evaluate F(3, 1).(b) Find and sketch the domain of F.(c) Find the range of F.
Let g(x, y) = cos(x + 2y).(a) Evaluate g(2, -1).(b) Find the domain of g.(c) Find the range of g.
A company makes three sizes of cardboard boxes: small, medium, and large. It costs $2.50 to make a small box, $4.00 for a medium box, and $4.50 for a large box. Fixed costs are $8000.(a) Express the
The wave heights h in the open sea depend on the speed v of the wind and the length of time t that the wind has been blowing at that speed. Values of the function h = f (v, t) are recorded in feet in
The wind-chill index W discussed in Example 2 has been modeled by the following function:W(T, v) = 13.12 + 0.6215T - 11.37v0.16 1 0.3965Tv0.16
A model for the surface area of a human body is given by the functionS = f (w, h) = 0.1091w0.425h0.725where w is the weight (in pounds), h is the height (in inches), and S is measured in square
Verify for the Cobb-Douglas production functionP(L, K) = 1.01L0.75K0.25discussed in Example 3 that the production will be doubled if both the amount of labor and the amount of capital are doubled.
A manufacturer has modeled its yearly production function P (the monetary value of its entire production in millions of dollars) as a Cobb-Douglas functionP(L, K) = 1.47L0.65K0.35where L is the
The temperature-humidity index I (or humidex, for short) is the perceived air temperature when the actual temperature is T and the relative humidity is h, so we can write I = f (T, h). The following
In Example 2 we considered the function W = f (T, v), where W is the wind-chill index, T is the actual temperature, and v is the wind speed. A numerical representation is given in Table 1 on page
Find the tangential and normal components of the acceleration vector of a particle with position functionr(t) = t i + 2t j + t2 k
A projectile is launched with an initial speed of 40 m/s from the floor of a tunnel whose height is 30 m. What angle of elevation should be used to achieve the maximum possible horizontal range of
An athlete throws a shot at an angle of 458 to the horizontal at an initial speed of 43 ft/s. It leaves his hand 7 ft above the ground.(a) Where is the shot 2 seconds later?(b) How high does the shot
A particle starts at the origin with initial velocity i- j + 3k. Its acceleration is a(t) = 6t i + 12t2 j - 6t k. Find its position function.
Find the velocity, speed, and acceleration of a particle moving with position function r(t) = (2t2 - 3) i + 2t j. Sketch the path of the particle and draw the position, velocity, and acceleration
A particle moves with position function r(t) = t ln t i + t j + e-t k. Find the velocity, speed, and acceleration of the particle.
The figure shows the curve C traced by a particle with position vector r(t) at time t.(a) Draw a vector that represents the average velocity of the particle over the time interval 3 < t <
Find an equation of the osculating plane of the curve x = sin 2t, y = t, z = cos 2t at the point (0, π, 1).
Find an equation of the osculating circle of the curve y = x4 - x2 at the origin. Graph both the curve and its osculating circle.
Find the curvature of the curve y = x4 at the point (1, 1).
Find the curvature of the ellipse x = 3 cos t, y = 4 sin t at the points (3, 0) and (0, 4).
For the curve given by r(t) = (sin3t, cos3t, sin2t), 0 < t < y2, find(a) The unit tangent vector,(b) The unit normal vector,(c) The unit binormal vector, and(d) The curvature.
Reparametrize the curve r(t) = et i + etsin t j + et cos t k with respect to arc length measured from the point (1, 0, 1) in the direction of increasing t.
The helix r1(t) = cos ti + sin t j + t k intersects the curve r2(t) = (1 + t) i + t2j + t3 k at the point (1, 0, 0). Find the angle of intersection of these curves.
Find the length of the curve r(t) = (2t3/2, cos 2t, sin 2t), 0 < t < 1.
Use Simpson’s Rule with n = 6 to estimate the length of the arc of the curve with equations x = t2, y = t3, z = t4, 0 < t < 3.
Let C be the curve with equations x = 2 - t3, y = 2t - 1, z = ln t. Find (a) the point where C intersects the xz-plane,(b) parametric equations of the tangent line at (1, 1, 0), and(c) an
If r(t) = t - i + t cos tπ j + sin πt k, evaluate So r(t) dt.
Find parametric equations for the tangent line to the curve x = 2 sin t, y = 2 sin 2t , z = 2 sin 3t at the point (1, √3 , 2). Graph the curve and the tangent line on a common screen.
Find a vector function that represents the curve of intersection of the cylinder x2 + y2 = 16 and the plane x + z = 5.
(a) Sketch the curve with vector function r(t) = ti + cos πt j + sin πt k t > 0(b) Find r'(t) and r''(t).
Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement.Different parametrizations of the same curve
Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement.The osculating circle of a curve C at a point
Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement.If |r(t)| = 1 for all t, then r'(t) is
Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement.If |r(t)| = 1 for all t, then |r'(t)| is a
Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement.If (t) = 0 for all t, the curve is a straight
Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement.Suppose f is twice continuously
Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement.The binormal vector is B(t) = N(t) x T(t).
Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement.If T(t) is the unit tangent vector of a
Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement.If r(t) is a differentiable vector function,
Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement.If u(t) and v(t) are differentiable vector
Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement.The derivative of a vector function is
Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement.The curve r(t) = (2t, 3 - t, 0) is a line
Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement.The curve r(t) = (0, t2, 4t) is a parabola.
Show that if a particle moves with constant speed, then the velocity and acceleration vectors are orthogonal.
Find the velocity, acceleration, and speed of a particle with the given position function. Sketch the path of the particle and draw the velocity and acceleration vectors for the specified value of
The following formulas, called the Frenet-Serret formulas, are of fundamental importance in differential geometry:1. dT/ds = kN2. dN/ds = kT + τB3. dB/ds = -τN 1. dT/as — кN 2. dN/ds — - кT +
Show that the curvature of a plane curve is k = |dΦ/ds|, where Φ is the angle between T and i; that is, Φ is the angle of inclination of the tangent line. (This shows that the definition of
Find equations of the normal plane and osculating plane of the curve at the given point.x = sin 2t, y = 2cos 2t, z = 4t; (0, 1, 2π)
Find the vectors T, N, and B at the given point.r(t) = (cos t, sin t, ln cos t), (1, 0, 0)

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