A mass attached to a spring, set in a container of molasses (a thick liquid) acts like a damped simple harmonic oscillator. The mass is 64 kg, the spring has a spring constant of 9 N/m and the molasses provides a damping force of 48 N. s/m.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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A mass attached to a spring, set in a container of molasses
(a thick liquid) acts like a damped simple harmonic
oscillator. The mass is 64 kg, the spring has a spring
constant of 9 N/m and the molasses provides a damping
force of 48 N. s/m.
(a) The system is
(A) underdamped
(B) overdamped
(C) critically damped
(b) A force of F(t)
-2e-3t/8
(in N) is applied to the
mass. If the method of undetermined coefficients is
used to find a particular solution, which of the
following is the best choice as a trial solution?
(c) Initially, at t = 0s, our mass is moving at a speed of 5
m/s as it passes through its equilibrium position
(x = 0m). If we are still under the force from part (b),
at what positive time, in seconds, does it again pass
through x = 0m? (If it never does, type dne).
Transcribed Image Text:A mass attached to a spring, set in a container of molasses (a thick liquid) acts like a damped simple harmonic oscillator. The mass is 64 kg, the spring has a spring constant of 9 N/m and the molasses provides a damping force of 48 N. s/m. (a) The system is (A) underdamped (B) overdamped (C) critically damped (b) A force of F(t) -2e-3t/8 (in N) is applied to the mass. If the method of undetermined coefficients is used to find a particular solution, which of the following is the best choice as a trial solution? (c) Initially, at t = 0s, our mass is moving at a speed of 5 m/s as it passes through its equilibrium position (x = 0m). If we are still under the force from part (b), at what positive time, in seconds, does it again pass through x = 0m? (If it never does, type dne).
(A) (At² + Bt) e 31/8
(B) Ate-31/8
(C) (A²+ Bt+C)e-31/8
(D) At sinh(3t/8) + Bt cosh(31/8)
(E) (At+B)e-3t/8
(F) Ae-3t/8
(G) At-e-3t/8
(H) A sinh(3t/8)+ B cosh(3t/8)
Transcribed Image Text:(A) (At² + Bt) e 31/8 (B) Ate-31/8 (C) (A²+ Bt+C)e-31/8 (D) At sinh(3t/8) + Bt cosh(31/8) (E) (At+B)e-3t/8 (F) Ae-3t/8 (G) At-e-3t/8 (H) A sinh(3t/8)+ B cosh(3t/8)
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