Find the volume of the largest circular cone that can be inscribed in a sphere of radius r.
> Find the vector that has the same direction as 6, 2, −3 but has length 4.
> Find a unit vector that has the same direction as the given vector. 8i - j + 4k
> Find a + b, 4a + 2b, |a |, and |a - b |. a = 8, 1, −4 , b = 5, −2, 1
> Find a + b, 4a + 2b, |a |, and |a - b |. a = 4i - 3j + 2k, b = 2i - 4k
> Use vectors to prove that the line joining the midpoints of two sides of a triangle is parallel to the third side and half its length.
> The cost function for a certain commodity is C(q) = 84 + 0.16q - 0.0006q2 + 0.000003q3 (a) Find and interpret C9s100d. (b) Compare C’(100) with the cost of producing the 101st item.
> Prove Property 5 of vectors algebraically for the case n = 3. Then use similar triangles to give a geometric proof.
> Figure 16 gives a geometric demonstration of Property 2 of vectors. Use components to give an algebraic proof of this fact for the case n = 2.
> Find a + b, 4a + 2b, |a |, and |a - b |. a = 5i + 3j, b = -i - 2j
> What is the relationship between the point (4, 7) and the vector (4, 7)? Illustrate with a sketch.
> Find a + b, 4a + 2b, |a |, and |a - b |. a = −3, 4 , b = 9, −1
> Find an equation of the set of all points equidistant from the points A (-1, 5, 3) and B (6, 2, -2). Describe the set.
> Consider the points P such that the distance from P to A (-1, 5, 3d is twice the distance from P to B (6, 2, -2). Show that the set of all such points is a sphere, and find its center and radius.
> If A, B, and C are the vertices of a triangle, find АВ + ВС + СА
> Write inequalities to describe the region. The region consisting of all points between (but not on) the spheres of radius r and R centered at the origin, where r < R
> Differentiate. f (t) = cot t / et
> Find the sum of the given vectors and illustrate geometrically. 3, −1 , −1, 5
> Write inequalities to describe the region. The region between the yz-plane and the vertical plane x = 5
> Describe in words the region of R3 represented by the equation(s) or inequality. x2 + y2 + z2 > 2z
> Find the sum of the given vectors and illustrate geometrically. −1, 4 , 6, −2
> Find dy/dx by implicit differentiation. x2 / x + y = y2 + 1
> Find the local and absolute extreme values of the function on the given interval. f (x) = x3 - 9x2 + 24x - 2, [0, 5]
> Newton’s Law of Gravitation says that the magnitude F of the force exerted by a body of mass m on a body of mass M is F = GmM / r2 where G is the gravitational constant and r is the distance between the bodies. (a) Find dF/dr and explain its meaning. Wha
> Use the guidelines of Section 4.5 to sketch the curve. y = 3x4 - 4x3 + 2
> Water is flowing at a constant rate into a spherical tank. Let V(t) be the volume of water in the tank and H(t) be the height of the water in the tank at time t. (a) What are the meanings of V’(t) and H’(t)? Are these derivatives positive, negative, or z
> A light is to be placed atop a pole of height h feet to illuminate a busy traffic circle, which has a radius of 40 ft. The intensity of illumination I at any point P on the circle is directly proportional to the cosine of the angle θ (see th
> Show that, for x > 0, x/1 + x2 < tan-1x < x
> A rectangular beam will be cut from a cylindrical log of radius 10 inches. (a) Show that the beam of maximal cross-sectional area is a square. (b) Four rectangular planks will be cut from the four sections of the log that remain after cutting the square
> In an automobile race along a straight road, car A passed car B twice. Prove that at some time during the race their accelerations were equal. State the assumptions that you make.
> A canister is dropped from a helicopter 500 m above the ground. Its parachute does not open, but the canister has been designed to withstand an impact velocity of 100 m/s. Will it burst?
> Use the guidelines of Section 4.5 to sketch the curve. y = -2x3 - 3x2 + 12x + 5
> The quantity of charge Q in coulombs (C) that has passed through a point in a wire up to time t (measured in seconds) is given by Q(t) = t3 - 2t2 + 6t + 2. Find the current when (a) t = 0.5 s and (b) t = 1 s. [See Example 3. The unit of current is an amp
> Investigate the family of curves given by f (x) = x4 + x3 + cx2 In particular you should determine the transitional value of c at which the number of critical numbers changes and the transitional value at which the number of inflection points changes. Il
> (a) If f (x) = 0.1ex + sin x, -4 ≤ x ≤ 4, use a graph of f to sketch a rough graph of the antiderivative F of f that satisfies F(0) = 0. (b) Find an expression for F(x). (c) Graph F using the expression in part (b). Compare with your sketch in part (a).
> A particle is moving with the given data. Find the position of the particle. a(t) = sin t + 3 cos t, s(0) = 0, v(0) = 2
> A particle is moving with the given data. Find the position of the particle. v(t) = 2t – 1/(1 + t2), s(0) = 1
> Find f. f ‘(t) = 2t - 3 sin t, f (0) = 5
> Use the guidelines of Section 4.5 to sketch the curve. y = 2 - 2x - x3
> Use the guidelines in Section 4.5 to sketch the curve y = x sin x, 0 ≤ x ≤ 2 π. Use Newton’s method when necessary.
> Use Newton’s method to find the absolute maximum value of the function f (t) = cos t + t - t2 correct to eight decimal places.
> Use Newton’s method to find all solutions of the equation sin x = x2 - 3x + 1 correct to six decimal places.
> Use Newton’s method to find the root of the equation x5 - x4 + 3x2 - 3x - 2 = 0 in the interval [1, 2] correct to six decimal places.
> A manufacturer determines that the cost of making x units of a commodity is C(x) = 1800 + 25x - 0.2x2 + 0.001x3 and the demand function is p(x) = 48.2 - 0.03x. (a) Graph the cost and revenue functions and use the graphs to estimate the production level f
> A hockey team plays in an arena with a seating capacity of 15,000 spectators. With the ticket price set at $12, average attendance at a game has been 11,000. A market survey indicates that for each dollar the ticket price is lowered, average attendance w
> The figure shows the graph of the derivative f ‘ of a function f. (a) On what intervals is f increasing or decreasing? (b) For what values of x does f have a local maximum or minimum? (c) Sketch the graph of f ’â
> A metal storage tank with volume V is to be constructed in the shape of a right circular cylinder surmounted by a A metal storage tank with volume V is to be constructed in the shape of a right circular cylinder surmounted by a
> The mass of the part of a metal rod that lies between its left end and a point x meters to the right is 3x2 kg. Find the linear density (see Example 2) when x is (a) 1 m, (b) 2 m, and (c) 3 m. Where is the density the highest? The lowest?
> Solve Exercise 55 when |CD| = 2 cm. Exercise 55: In ΔABC, D lies on AB, CD AB, |AD| = |BD| = 4 cm, and |CD| = 5 cm. Where should a point P be chosen on CD so that the sum |PA | + |PB | + |PC | is a minimum?
> In ΔABC, D lies on AB, CD AB, |AD| = |BD| = 4 cm, and |CD| = 5 cm. Where should a point P be chosen on CD so that the sum |PA | + |PB | + |PC | is a minimum?
> Find the smallest possible area of an isosceles triangle that is circumscribed about a circle of radius r.
> Find the point on the hyperbola xy = 8 that is closest to the point (3, 0).
> Find two positive integers such that the sum of the first number and four times the second number is 1000 and the product of the numbers is as large as possible.
> Sketch the graph of a function that satisfies the given conditions. f is odd, f ‘(x) f'(x) > 0 for x > 2, f"(x) > 0 for 0 < x< 3, f"(x) < 0 for x > 3, lim f(x) = -2 X 00
> Let g(x) = f (x2), where f is twice differentiable for all x, f ‘(x) > 0 for all x ≠ 0, and f is concave downward on (-∞, 0) and concave upward on (0, ∞). (a) At what numbers does g have an extreme value? (b) Discuss the concavity of g.
> For what values of the constants a and b is (1, 3) a point of inflection of the curve y = ax3 + bx2?
> By applying the Mean Value Theorem to the function f (x) = x1/5 on the interval [32, 33], show that 2 < 5 33 < 2.0125
> (a) The volume of a growing spherical cell is V = 4/3 πr3, where the radius r is measured in micrometers (1 μm − 1026 m). Find the average rate of change of V with respect to r when r changes from (i) 5 to 8 μm (ii) 5 to 6 μm (iii) 5 to 5.1 μm (b) Find t
> Suppose that f is continuous on [0, 4], f (0) = 1, and 2 ≤ f ‘(x) ≤ 5 for all x in (0, 4). Show that 9 ≤ f (4) ≤ 21.
> Show that the equation 3x + 2 cos x + 5 = 0 has exactly one real root.
> Investigate the family of functions f (x) = ln(sin x + C). What features do the members of this family have in common? How do they differ? For which values of C is f continuous on (-∞, ∞)? For which values of C does f have no graph at all? What happens a
> (a) Find the average rate of change of the area of a circle with respect to its radius r as r changes from (i) 2 to 3 (ii) 2 to 2.5 (iii) 2 to 2.1 (b) Find the instantaneous rate of change when r = 2. (c) Show that the rate of change of the area of a cir
> (a) Graph the function f (x) = 1/(1 + e1/x). (b) Explain the shape of the graph by computing the limits of f (x) as x approaches ∞, -∞, 0+, and 0-. (c) Use the graph of f to estimate the coordinates of the inflection points. (d) Use your CAS to compute a
> Produce graphs of f that reveal all the important aspects of the curve. Use graphs of f ‘ and f ’’ to estimate the intervals of increase and decrease, extreme values, intervals of concavity, and inflection points. In Exercise 35 use calculus to find thes
> Produce graphs of f that reveal all the important aspects of the curve. Use graphs of f ‘ and f ’’ to estimate the intervals of increase and decrease, extreme values, intervals of concavity, and inflection points. In Exercise 35 use calculus to find thes
> A spherical balloon is being inflated. Find the rate of increase of the surface area (S = 4πr2) with respect to the radius r when r is (a) 1 ft, (b) 2 ft, and (c) 3 ft. What conclusion can you make?
> Use the guidelines of Section 4.5 to sketch the curve. y = x + ln(x2 + 1)
> Use the guidelines of Section 4.5 to sketch the curve. y = (x – 2)e-x
> Sketch the graph of a function that satisfies the given conditions. f (0) = 0, f is continuous and even, f ‘(x) = 2x if 0 < x < 1, f ‘(x) = -1 if 1 < x < 3, f ‘(x) = 1 if x > 3
> Use the guidelines of Section 4.5 to sketch the curve. y = sin-1(1/x)
> Use the guidelines of Section 4.5 to sketch the curve. y = 4x - tan x, -π/2 < x
> Use the guidelines of Section 4.5 to sketch the curve. y = ex sin x, -π ≤ x ≤ π
> A stone is dropped into a lake, creating a circular ripple that travels outward at a speed of 60 cm/s. Find the rate at which the area within the circle is increasing after (a) 1 s, (b) 3 s, and (c) 5 s. What can you conclude?
> Some of the highest tides in the world occur in the Bay of Fundy on the Atlantic Coast of Canada. At Hopewell Cape the water depth at low tide is about 2.0 m and at high tide it is about 12.0 m. The natural period of oscillation is a little more than 12
> Differentiate. y = c cos t + t2 sin t
> (a) Sodium chlorate crystals are easy to grow in the shape of cubes by allowing a solution of water and sodium chlorate to evaporate slowly. If V is the volume of such a cube with side length x, calculate dV / dx when x = 3 mm and explain its meaning. (b
> Find the local and absolute extreme values of the function on the given interval. f (x) = x2e-x, [-1, 3]
> Find the local and absolute extreme values of the function on the given interval. f (x) = x + 2 cos x, [-π, π ]
> Traditionally, the earth’s surface has been modeled as a sphere, but the World Geodetic System of 1984 (WGS-84) uses an ellipsoid as a more accurate model. It places the center of the earth at the origin and the north pole on the positive z-axis. The dis
> Each edge of a cubical box has length 1 m. The box contains nine spherical balls with the same radius r. The center of one ball is at the center of the cube and it touches the other eight balls. Each of the other eight balls touches three sides of the bo
> A solid has the following properties. When illuminated by rays parallel to the z-axis, its shadow is a circular disk. If the rays are parallel to the y-axis, its shadow is a square. If the rays are parallel to the x-axis, its shadow is an isosceles trian
> Find an equation of the largest sphere that passes through the point (-1, 1, 4) and is such that each of the points (x, y, z) inside the sphere satisfies the condition x2 + y2 + z2, 136 + 2 (x + 2y + 3z)
> A plane is capable of flying at a speed of 180 km/h in still air. The pilot takes off from an airfield and heads due north according to the plane’s compass. After 30 minutes of flight time, the pilot notices that, due to the wind, the plane has actually
> Let L be the line of intersection of the planes cx + y + z = c and x - cy + cz = 21, where c is a real number. (a). Find symmetric equations for L. (b). As the number c varies, the line L sweeps out a surface S. Find an equation for the curve of intersec
> Let B be a solid box with length L, width W, and height H. Let S be the set of all points that are a distance at most 1 from some point of B. Express the volume of S in terms of L, W, and H.
> Differentiate. g(θ ) = e θ (tan θ - θ )
> Find dy/dx by implicit differentiation. x3 - xy2 + y3 = 1
> Find an equation for the surface consisting of all points P for which the distance from P to the x-axis is twice the distance from P to the yz-plane. Identify the surface.
> (a) Graph several members of the family of functions f (x) = (2cx - x2)/c3 for c > 0 and look at the regions enclosed by these curves and the x-axis. Make a conjecture about how the areas of these regions are related. (b) Prove your conjecture in part (a
> Find the minimum value of the area of the region under the curve y = x + 1/x from x = a to x = a + 1.5, for all a > 0.
> The figure shows a region consisting of all points inside a square that are closer to the center than to the sides of the square. Find the area of the region. 2 2 2. 2.
> Given the point (a,b) in the first quadrant, find the downward-opening parabola that passes through the point (a,b) and the origin such that the area under the parabola is a minimum.
> The figure shows a parabolic segment, that is, a portion of a parabola cut off by a chord AB. It also shows a point C on the parabola with the property that the tangent line at C is parallel to the chord AB. Archimedes proved that the area of the parabol
> Find an equation for the surface consisting of all points that are equidistant from the point s21, 0, 0d and the plane x = 1. Identify the surface.
> (a) A company makes computer chips from square wafers of silicon. It wants to keep the side length of a wafer very close to 15 mm and it wants to know how the area A(x) of a wafer changes when the side length x changes. Find A’(15) and explain its meani
> Find an equation for the surface obtained by rotating the line z = 2y about the z-axis.
> Find the point on the parabola y = 1 - x2 at which the tangent line cuts from the first quadrant the triangle with the smallest area.
> A particle moves with position function s = t4 - 4t3 - 20t2 + 20t t ≥ 0 (a) At what time does the particle have a velocity of 20 m/s? (b) At what time is the acceleration 0? What is the significance of this value of t?
> Show that the inflection points of the curve y = (sin x)/x lie on the curve y2 (x4 + 4) = 4.
> Show that x2y2 (4 - x2)(4 - y2) ≤ 16 for all numbers x and y such that |x | ≤ 2 and |y | ≤ 2.
> Does the function f (x) = e10| x-2| - x2 have an absolute maximum? If so, find it. What about an absolute minimum?
