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Consider the following boundary value problem (E) : u a2 0<2< 1, t>0.. (1) u(0, t) – 0, u(1, t) – 0, t > 0.. (2) u(x, 0) = f(x), 0 < r<1…(3), ue(1, 0) – 2, 0 4 b. A1 = 0,42 = -2, A3 = 3 and A, = 0, Vn > 4 c. An = 0, Vn 21 d. None of the above (3) By using the initial condition (4), we obtain that 2(–1)"+1 a. B Vn 21 %3D b. Bn Vn 21 с. В, — 0. d. None of the above

Consider the following boundary value problem (E) : u a2 0<2< 1, t>0.. (1) u(0, t) – 0, u(1, t) – 0, t > 0.. (2) u(x, 0) = f(x), 0 < r<1…(3), ue(1, 0) – 2, 0 4 b. A1 = 0,42 = -2, A3 = 3 and A, = 0, Vn > 4 c. An = 0, Vn 21 d. None of the above (3) By using the initial condition (4), we obtain that 2(–1)"+1 a. B Vn 21 %3D b. Bn Vn 21 с. В, — 0. d. None of the above

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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pde part 3
Consider the following boundary value problem (E) : u a2 0<2< 1, t>0.. (1) u(0, t) – 0, u(1, t) – 0, t > 0.. (2) u(x, 0) = f(x), 0 < r<1…(3), ue(1, 0) – 2, 0 <r <1…(4), where f(r) = 3 sin(wx) – 2 sin(3rz). (1) By using the method of separation of variables, the family of solutions un(r, t) for equations (1) and (2) is: a. Un(x, t) = [An cos(nat) + B, sin(nxt)] cos (na2) b. Un(r, t) – [An cos(nat) + Bn sin(nat)] sin(nar) c. Un(2, t) = [A, cos(nax) + B, sin(naz)] sin(nat) d. None of the above +00 Let now u(r, t) = Un(x, t) be a solution of (E). %3D (2) By using the initial condition (3), we obtain that a. A1 = 3,A2 = 0, A3 = -2 and An = 0, Vn > 4 b. A1 = 0,42 = -2, A3 = 3 and A, = 0, Vn > 4 c. An = 0, Vn 21 d. None of the above (3) By using the initial condition (4), we obtain that 2(–1)"+1 a. B Vn 21 %3D b. B Vn 21 с. В, — 0. d. None of the above d.
Transcribed Image Text:Consider the following boundary value problem (E) : u a2 0<2< 1, t>0.. (1) u(0, t) – 0, u(1, t) – 0, t > 0.. (2) u(x, 0) = f(x), 0 < r<1…(3), ue(1, 0) – 2, 0 <r <1…(4), where f(r) = 3 sin(wx) – 2 sin(3rz). (1) By using the method of separation of variables, the family of solutions un(r, t) for equations (1) and (2) is: a. Un(x, t) = [An cos(nat) + B, sin(nxt)] cos (na2) b. Un(r, t) – [An cos(nat) + Bn sin(nat)] sin(nar) c. Un(2, t) = [A, cos(nax) + B, sin(naz)] sin(nat) d. None of the above +00 Let now u(r, t) = Un(x, t) be a solution of (E). %3D (2) By using the initial condition (3), we obtain that a. A1 = 3,A2 = 0, A3 = -2 and An = 0, Vn > 4 b. A1 = 0,42 = -2, A3 = 3 and A, = 0, Vn > 4 c. An = 0, Vn 21 d. None of the above (3) By using the initial condition (4), we obtain that 2(–1)"+1 a. B Vn 21 %3D b. B Vn 21 с. В, — 0. d. None of the above d.
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