Solve the initial-value problem. 4y'' + 4y' + 3y = 0, y (0) = 0, y' (0) = 1
> Use Stokes’ Theorem to evaluate ∫C F ∙ dr, where F (x, y, z) = xy i + yz j + z x k, and C is the triangle with vertices (1, 0, 0), (0, 1, 0), and (0, 0, 1), oriented counterclockwise as viewed from above.
> Use power series to solve the differential equation. y'' + xy' + y = 0
> Use power series to solve the differential equation. (x – 3) y' + 2y = 0
> Use power series to solve the differential equation. y' = x2y
> Solve the differential equation. Y'' - 6y' + 9y = 0
> Use power series to solve the differential equation. y' – y = 0
> How do you find the cross product a × b of two vectors if you know their lengths and the angle between them? What if you know their components?
> Write expressions for the scalar and vector projections of b onto a. Illustrate with diagrams.
> How do you find the dot product a ∙ b of two vectors if you know their lengths and the angle between them? What if you know their components?
> How do you find the vector from one point to another?
> How do you add two vectors geometrically? How do you add them algebraically?
> Use Stokes’ Theorem to evaluate ∫∫S curl F ∙ dS, where F (x, y, z) = x2yz i + yz2 j + z3exy k, S is the part of the sphere x2 + y2 + z2 = 5 that lies above the plane z = 1, and S is oriented upward.
> Write equations in standard form of the six types of quadric surfaces.
> How do you find the angle between two intersecting planes?
> (a). How do you find the area of the parallelogram determined by a and b? (b). How do you find the volume of the parallelepiped determined by a, b, and c?
> What is the difference between a vector and a scalar?
> Solve the differential equation. y'' - 4y' + 13y = 0
> Solve the differential equation or initial-value problem using the method of undetermined coefficients. y" – y = xe2", y(0) = 0, y'(0) = 1
> Solve the differential equation. 3y'' = 4y'
> For the spring in Exercise 4, find the damping constant that would produce critical damping. Exercise 4: A force of 13 N is needed to keep a spring with a 2-kg mass stretched 0.25 m beyond its natural length. The damping constant of the spring is c = 8
> For the spring in Exercise 3, find the mass that would produce critical damping. Exercise 3: A spring with a mass of 2 kg has damping constant 14, and a force of 6 N is required to keep the spring stretched 0.5 m beyond its natural length. The spring i
> A force of 13 N is needed to keep a spring with a 2-kg mass stretched 0.25 m beyond its natural length. The damping constant of the spring is c = 8. (a). If the mass starts at the equilibrium position with a velocity of 0.5 m/s, find its position at time
> Verify that Stokes’ Theorem is true for the vector field F (x, y, z) = x2 i + y2 j + z2 k, where S is the part of the paraboloid z = 1 - x2 - y2 that lies above the xy-plane and S has upward orientation.
> Solve the differential equation or initial-value problem using the method of undetermined coefficients. 9y" + y = e2*
> Consider a spring subject to a frictional or damping force. (a). In the critically damped case, the motion is given by x = c1ert + c2tert. Show that the graph of x crosses the t-axis whenever c1 and c2 have opposite signs. (b). In the overdamped case, th
> Solve the differential equation. 2 d2y/dt2 + 2 dy/dt - y = 0
> Solve the differential equation or initial-value problem using the method of undetermined coefficients. y" + y' – 2y = x + sin 2x, y(0) = 1, y'(0) = 0 %3D
> Solve the differential equation or initial-value problem using the method of undetermined coefficients. y'' + 2y' - 8y = 1 - 2x2
> Solve the differential equation or initial-value problem using the method of undetermined coefficients. у" — 4y' + 4у %3х — sin x
> Solve the differential equation or initial-value problem using the method of undetermined coefficients. у" — 4у' + 5у — е*
> Solve the differential equation or initial-value problem using the method of undetermined coefficients. у" — 2у' + 2у х+e*
> Write a trial solution for the method of undetermined coefficients. Do not determine the coefficients. у" + 2y' + 10у 3D х?е-* сos 3x
> Write a trial solution for the method of undetermined coefficients. Do not determine the coefficients. y" + 3y' – 4y = (x³ + x)e*
> Evaluate the surface integral. ∫∫S F ∙ dS, where F (x, y, z) = x2 i + xy j + z k and S is the part of the paraboloid z = x2 + y2 below the plane z = 1 with upward orientation
> (a). Write the general form of a second-order nonhomogeneous linear differential equation with constant coefficients. (b). What is the complementary equation? How does it help solve the original differential equation? (c). Explain how the method of undet
> Write a trial solution for the method of undetermined coefficients. Do not determine the coefficients. у" — Зу' + 2у — е* + sin x
> Write a trial solution for the method of undetermined coefficients. Do not determine the coefficients. y" + 4y = cos 4x + cos 2x %3D COS
> Write a trial solution for the method of undetermined coefficients. Do not determine the coefficients. y" – y' – 2y = xe*cos x
> Solve the differential equation. d2R /dt2 + 6 dR/dt + 34R = 0
> Solve the differential equation. y = y''
> Solve the differential equation. 9y'' + 4y = 0
> Solve the differential equation. 4y'' + 4y' + y = 0
> Solve the differential equation. y'' + y' - 12y = 0
> Solve the differential equation. y'' + 2y = 0
> Prove each identity, assuming that S and E satisfy the conditions of the Divergence Theorem and the scalar functions and components of the vector fields have continuous second-order partial derivatives. Sſ Da f ds = {[[ v?fav v²fdV E
> Evaluate the surface integral. ∫∫S F ∙ dS, where F (x, y, z) = xz i - 2y j + 3x k and S is the sphere x2 + y2 + z2 = 4 with outward orientation
> Prove each identity, assuming that S and E satisfy the conditions of the Divergence Theorem and the scalar functions and components of the vector fields have continuous second-order partial derivatives. curl F· dS = 0
> Solve the boundary-value problem, if possible. y'' + 6y' = 0, y (0) = 1, y (1) = 0
> Prove each identity, assuming that S and E satisfy the conditions of the Divergence Theorem and the scalar functions and components of the vector fields have continuous second-order partial derivatives. || a·n ds = 0, where a is a constant vector %3
> Solve the initial-value problem. y'' – y' - 12y = 0, y (1) = 0, y' (1) = 1
> Solve the initial-value problem. 3y'' - 2y' - y = 0, y (0) = 0, y' (0) = -4
> Solve the initial-value problem. 9y'' + 12y' + 4y = 0, y (0) = 1, y' (0) = 0
> Solve the initial-value problem. y'' - 2y' - 3y = 0, y (0) = 2, y'(0) = 2
> Solve the initial-value problem. y'' + 3 = 0, y (0) = 1, y' (0) = 3
> Use a computer algebra system to plot the vector field F (x, y, z) = sin x cos2y i + sin3y cos4z j + sin5z cos6x k in the cube cut from the first octant by the planes x = π/2, y = π/2, and z = π/2. Then compute the flux across the surface of the cube.
> Evaluate the surface integral. ∫∫S (x2z + y2z) dS, where S is the part of the plane z = 4 + x + y that lies inside the cylinder x2 + y2 = 4
> Use the Divergence Theorem to calculate the surface integral ∫∫S F dS; that is, calculate the flux of F across S. F (x, y, z) = ey tan z i + y√3 - x2 j + x sin y k, S is the surface of the solid that lies above the xy-plane and below the surface z = 2
> Use the Divergence Theorem to calculate the surface integral ∫∫S F dS; that is, calculate the flux of F across S. F = |r |2 r, where r = x i + y j + z k, S is the sphere with radius R and center the origin
> Solve the differential equation. 3 d2V/dt2 + 4 dV/dt + 3V = 0
> The vector field F is shown in the xy-plane and looks the same in all other horizontal planes. (In other words, F is independent of z and its z-component is 0.) (a). Is div F positive, negative, or zero? Explain. (b). Determine whether curl F = 0. If n
> Define the linearization of f at (a, b). What is the corresponding linear approximation? What is the geometric interpretation of the linear approximation?
> (a). Write the definition of the triple integral of f over a rectangular box B. (b). How do you evaluate ∫∫∫B f (x, y, z) dV? (c). How do you define ∫∫∫B f (x, y, z) dV if E is a bounded solid region that is not a box? (d). What is a type 1 solid region?
> What is a function of three variables? How can you visualize such a function?
> Determine whether or not F is a conservative vector field. If it is, find a function f such that F = ∇f. F (x, y) = y2exy i + (1 + xy) exy j
> Determine whether or not F is a conservative vector field. If it is, find a function f such that F = ∇f. F (x, y) = (y2 - 2x) i + 2xy j
> How do you change from rectangular coordinates to polar coordinates in a double integral? Why would you want to make the change?
> Evaluate the surface integral. ∫∫S z dS, where S is the part of the paraboloid z = x2 + y2 that lies under the plane z = 4
> (a). How do you define ∫∫D f (x, y) dA if D is a bounded region that is not a rectangle? (b). What is a type I region? How do you evaluate ∫∫D f (x, y) dA if D is a type I region? (c). What is a type II region? How do you evaluate ∫∫D f (x, y) dA if D is
> The figure shows a curve C and a contour map of a function f whose gradient is continuous. Find ∫C ∇f dr. yA 60 50 40 C 30 20 10
> What does lim (x, y) → (a, b) f (x, y) = L mean? How can you show that such a limit does not exist?
> If F is the vector field of Example 5, show that ∫C F ∙ dr = 0 for every simple closed path that does not pass through or enclose the origin.
> (a). What is a closed set in R2? What is a bounded set? (b). State the Extreme Value Theorem for functions of two variables. (c). How do you find the values that the Extreme Value Theorem guarantees?
> State the Second Derivatives Test.
> (a). If f has a local maximum at (a, b), what can you say about its partial derivatives at (a, b)? (b). What is a critical point of f?
> (a). Write an expression as a limit for the directional derivative of f at (x0, y0) in the direction of a unit vector u =〈a, b〉. How do you interpret it as a rate? How do you interpret it geometrically? (b). If f is differentiable, write an expression fo
> Match the vector fields F with the plots labeled I–IV. Give reasons for your choices. F (x, y) = 〈y, x - y〉 3 -3 -3 en
> The figure shows the vector field F (x, y) = 〈2xy, x2〉 and three curves that start at (1, 2) and end at (3, 2). (a). Explain why ∫C F ∙ dr has the same value for all three curves.
> (a). Find an equation of the tangent plane at the point (4, -2, 1) to the parametric surface S given by (b). Use a computer to graph the surface S and the tangent plane found in part (a). (c). Set up, but do not evaluate, an integral for the surface a
> (a). If a transformation T is given by x = g (u, v), y = h (u, v), what is the Jacobian of T? (b). How do you change variables in a double integral? (c). How do you change variables in a triple integral?
> (a). How do you change from rectangular coordinates to cylindrical coordinates in a triple integral? (b). How do you change from rectangular coordinates to spherical coordinates in a triple integral? (c). In what situations would you change to cylindrica
> Determine whether or not the given set is (a) open, (b) connected, and (c) simply-connected. {(x, y) | 0 < y < 3}
> Match the functions f with the plots of their gradient vector fields labeled I–IV. Give reasons for your choices. f (x, y) = x2 + y2 4 -4 -4 4.
> If F (x, y) = sin y i + (1 + x cos y) j, use a plot to guess whether F is conservative. Then determine whether your guess is correct.
> (a). Write formulas for the unit normal and binormal vectors of a smooth space curve r (t). (b). What is the normal plane of a curve at a point? What is the osculating plane? What is the osculating circle?
> Explain how the method of Lagrange multipliers works in finding the extreme values of f (x, y, z) subject to the constraint g (x, y, z) = k. What if there is a second constraint h (x, y, z) = c?
> What do the following statements mean? (a). f has a local maximum at (a, b). (b). f has an absolute maximum at (a, b). (c). f has a local minimum at (a, b). (d). f has an absolute minimum at (a, b). (e). f has a saddle point at (a, b).
> (a). Sketch the vector field F (x, y) = i + x j and then sketch some flow lines. What shape do these flow lines appear to have? (b). If parametric equations of the flow lines are x = x (t), y = y (t), what differential equations do these functions satisf
> The flow lines (or streamlines) of a vector field are the paths followed by a particle whose velocity field is the given vector field. Thus, the vectors in a vector field are tangent to the flow lines. (a). Use a sketch of the vector field F (x, y) = x i
> Find the positively oriented simple closed curve C for which the value of the line integral ∫C (y3 – y) dx - 2x3 dy is a maximum.
> At time t = 1, a particle is located at position (1, 3). If it moves in a velocity field F (x, y) = 〈xy - 2, y^2 - 10〉 find its approximate location at time t = 1.05.
> Find the area of the part of the sphere x2 + y2 + z2 = a2 that lies inside the cylinder x2 + y2 = ax.
> The figure shows the surface created when the cylinder y2 + z2 = 1 intersects the cylinder x2 + z2 = 1. Find the area of this surface. ZA x- y
> Find the area of the part of the sphere x2 + y2 + z2 = 4z that lies inside the paraboloid z = x2 + y2.
> Match the functions f with the plots of their gradient vector fields labeled I–IV. Give reasons for your choices. f (x, y) = x (x + y) II 4 -4 4 -4
> (a). Show that the parametric equations x = a sin u cos v, y = b sin u sin v, z = c cos u, 0 < u
> (a). Set up, but do not evaluate, a double integral for the area of the surface with parametric equations (b). Eliminate the parameters to show that the surface is an elliptic paraboloid and set up another double integral for the surface area. (c). Use
> Match the vector fields F on R3 with the plots labeled I–IV. Give reasons for your choices. F (x, y, z) = x i + y j + 3 k III 1 -1 -101 y
> Match the vector fields F with the plots labeled I–IV. Give reasons for your choices. F (x, y) = 〈y, y + 2〉 III 3 -3 3 -3 هر ار ا دهه ا
> Let F (x) = (r2 - 2r) x, where x = 〈x, y〉 and r − |x |. Use a CAS to plot this vector field in various domains until you can see what is happening. Describe the appearance of the plot and explain it by finding the points where F (x) = 0.
> (a). Sketch the curve C with parametric equations x = cos t y = sin t z = sin t 0 (b) Find ſc 2.xe²" dx + (2.x²e + 2y cot z) dy – y°csc?z dz.
