Q3: The time dependance of the position r(t) of an underdamped oscillator (of drag co- efficient c and spring constant k) can be described by a sinusoidal curve with exponentially decaying amplitude. So, one can conventionally plot exponential-decay functions f(t) and -f(t) that "sandwich" æ(t) and mimic its exponential decay. Both f(t) and its mirror image -f(t) touch r(t) at some time instances t, and t,, respectively, where n = 1, 2, 3, - ... (See Fig. 3.4.3 in your assigned textbook). Following the same convention of the constants y and wa as we did in the class, suppose that r(t) is given by x(t) = Aet cos(wat), and, hence, f(t) is given by f(t) = Ae-, then solve the following (a) Find the first two instants of time to and t, at which f (t) and – f(t) touch x(t). (b) Since r(t) is oscillatory, it has multiple local maxima. Suppose that {T,} are the time instances at which x(t) has a local maximum, where n = 1, 2, 3, -.., then find 71 and T2. (c) Discuss the results you obtained from the previous two parts. (d) Comapre the ratio tal and nl and comment about the results. I(tm) 1(Tn) Q4: (Optional) Investigate the motion of a harmonic oscillator subject to a damping force of constant magnitude.
Q3: The time dependance of the position r(t) of an underdamped oscillator (of drag co- efficient c and spring constant k) can be described by a sinusoidal curve with exponentially decaying amplitude. So, one can conventionally plot exponential-decay functions f(t) and -f(t) that "sandwich" æ(t) and mimic its exponential decay. Both f(t) and its mirror image -f(t) touch r(t) at some time instances t, and t,, respectively, where n = 1, 2, 3, - ... (See Fig. 3.4.3 in your assigned textbook). Following the same convention of the constants y and wa as we did in the class, suppose that r(t) is given by x(t) = Aet cos(wat), and, hence, f(t) is given by f(t) = Ae-, then solve the following (a) Find the first two instants of time to and t, at which f (t) and – f(t) touch x(t). (b) Since r(t) is oscillatory, it has multiple local maxima. Suppose that {T,} are the time instances at which x(t) has a local maximum, where n = 1, 2, 3, -.., then find 71 and T2. (c) Discuss the results you obtained from the previous two parts. (d) Comapre the ratio tal and nl and comment about the results. I(tm) 1(Tn) Q4: (Optional) Investigate the motion of a harmonic oscillator subject to a damping force of constant magnitude.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Transcribed Image Text:Q3: The time dependance of the position 2(t) of an underdamped oscillator (of drag co-
efficient c and spring constant k) can be described by a sinusoidal curve with exponentially
decaying amplitude. So, one can conventionally plot exponential-decay functions f(t) and
-f(t) that "sandwich" x(t) and mimic its exponential decay. Both f(t) and its mirror image
-f(t) touch r(t) at some time instances t„, and t,, respectively, where n = 1,2, 3, -... (See Fig.
3.4.3 in your assigned textbook). Following the same convention of the constants y and wa as
we did in the class, suppose that #(t) is given by
x(t) = Ae cos(wat),
and, hence, f(t) is given by
f(t) = Ae-.
then solve the following
(a) Find the first two instants of time to and t, at which f(t) and - f(t) touch x(t).
(b) Since r(t) is oscillatory, it has multiple local maxima. Suppose that {Tn} are the time
instances at which x(t) has a local maximum, where n = 1, 2, 3, -.., then find T1 and T2.
(c) Discuss the results you obtained from the previous two parts.
(d) Comapre the ratio tatl and (nt1l and comment about the results.
I(tn)
I(Tn)
Q4: (Optional) Investigate the motion of a harmonic oscillator subject to a damping force
of constant magnitude.
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