In Problems 1– 4 find the steady-state temperature u(r, θ) in a circular plate of radius r = 1 if the temperature on the circumference is as given.
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Chapter 13 Solutions
Differential Equations with Boundary-Value Problems (MindTap Course List)
- Review Question 17 Find a parameterization for the line segment from (2, –1) to (-6, 4). a) O (t) = -1– 5t and y (t) = 2 + 8 t, t e [0, 1] %3D b) O (t) = -1+ 5t and y (t) = 2 – 8 t, t E [0, 1] c) a (t) = 2 + 8 t and y (t) = -1- 5 t, te [0,1] %3D d) O a (t) = -2 + 8t and y (t) = 1 – 5 t, t E [0,1] O a (t) = 2 8t and y (t) = -1+ 5t, te [0, 1] f) O None of the above. Review La Question 18arrow_forward1. Let {yt} be SARIMA(0, 0, 2) × (0, 0, 1)12 with MA coefficients 0.2, 0.3, seasonal MA coefficient 0.5 and Et~ WN(0, ²) with o² = 1. Which of the following equation(s) governs {yt}? yt = (1+0.2L + 0.3L²)(1+0.5L¹2) et Yt et +0.2et-1 +0.3€t-2 +0.5et-12 +0.1et-13 +0.15€t-14 Yt +0.2yt-1+0.3yt-2 +0.5yt-12 +0.1yt-13 +0.15yt-14 = €t Yt = (1+0.2L + 0.3L² +0.5L¹2 +0.1L¹³ +0.15L¹4) etarrow_forward#6 onlyarrow_forward
- 13. The monthly average temperature for a particular city reaches a minimum of 38° in January and a maximum of 80° in July. The function T(t) = A cos(Bt) + C is a model for the average temperature of this city t months after January. Determine the constants A, B, and C.arrow_forwardFor each dif erential equation in Problems 1–21, find the general solutionby finding the homogeneous solution and a particular solution. Please DO NOT YOU THE PI method where 1/f(r) * x. Dont do that. Instead do this, assume for yp = to something, do the 1 and 2 derivative of it and then plug it in the equation to find the answer.arrow_forward2 Discuss the stability of equilibrium points of the following ODE: Sa = -a³ + y°, %3D y' = -x.arrow_forward
- Hh.101.arrow_forwardFor each dif erential equation in Problems 1–21, find the general solutionby finding the homogeneous solution and a particular solution. Please DO NOT YOU THE PI method where 1/f(r) * x. Dont do that. Instead do this, assume for yp = to something, do the 1 and 2 derivative of it and then plug it in the equation to find the answer.arrow_forwardProblem 1. Let w = f(x,Y, z) be a differentiable function at (1, 3, –1), x = 1+t– t³, y = 3– 2t, and z = e' – 2. Assume that fe(1, 3, –1) = 2, f,(1, 3, – 1) = 7 and f:(1,3, -1) = 3 (a) Find (b) Let f(1,3, –1) = f(x, y, z) = 4 at (1, 3, –1). dw at t = 0. dt = 4. Find the tangent plane to the differentiable level surfacearrow_forward
- QI. Consider a spring mass system given in Fig 1 with mass of 1kg attached to a spring with K=10. The motion is damped with C=6 and is being driven by a force given by 25 cos 4t . If the spring is released from rest, find the equation of displacement y(t). Note: You cannot use the direct formulas for constants in particular solution. Spring Mass r(t) Dashpot Fig. 1arrow_forwardA classical equation of mathematics is Laplace's equation, which arises in both theory and applications. It governs fluid flow, electrostatic potentials, and the steady-state distribution of heat in a conducting medium. In two dimensio a²u №²u 2 Laplace's equation is Əx u(x,y) = ex cos(-6y) = + = 0. Show that the following function is harmonic; that is, it satisfies Laplace's equ dy² Find the second-order partial derivatives of u(x,y) with respect to x and y, respectively. a²u a²uarrow_forwardLinear example: Problem 3 (modified from exercise 1.4.10): dx Newton's law of cooling states that dt = -k (x - A), where x(t) is the temperature of an object at time t, A is the temperature of the object's surroundings and k is a constant. a) If the ambient temperature A is constant, only one choice of sign for k makes physical sense - either k is positive or k is negative. Explain which choice is correct. b) Suppose the object sits outside, in Potsdam, over the course of a year. The ambient temperature will vary with time suppose A Ao cos(wt), where Ao and wo are constants. %3D i. What might be reasonable values for A, and w,? ii. Let's say that initially (at time t = 0) the object is at room temperature (so x(0) = To, where T, represents room temperature). What impact, in the long-run, does the value T, have on the temperature x(t) of the object?arrow_forward
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