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cbkhm
14.05.2021 •
Mathematics
Consider the initial value problem my''+cy'+ky=F(t), y(0)=0, y'(0)=0, modeling the motion of a spring mass dashpot system initially at rest and subjected to an applied force F(t), where the unit of force is the Newton (N). Assume that m=2 kilograms, c=8 kilograms per second, k=80 Newtons per meter, and F(t)=20 sin(6t) Newtons.
1. Solve the initial value problem. y(t)=?
2. Determine the long term behavior of the system. Is lim as t goes to infinity of y(t)=0? If it is, enter zero. If not, enter a function that approximates y(t) for very large positive values of t. For very large positive values of t, y(t) is approximately.. ?
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Ответ:
Hence, the
and approximately value of
is
.
Given :
Where
kilograms
Explanation :
(1)
Solve the initial value problem.![y(t)](/tpl/images/1323/2677/2c51f.png)
Auxilary equations :![F(t)=0](/tpl/images/1323/2677/4f7d0.png)
The complementary solution is![y_c=e^{-2t}\left(c_1\cos 6t+c_2\sin 6t\right)](/tpl/images/1323/2677/f6702.png)
The particular Integral,![y_p=\frac{1}{f(D)}F(t)](/tpl/images/1323/2677/ea466.png)
Hence the general solution is :![y=y_c+y_p=e^{-2t}(c_1\cos 6t+c_2\sin 6t)-\frac{25}{148}(6\cos 6t-\sin 6t)](/tpl/images/1323/2677/40ed8.png)
Now we use given initial condition.
(2)
Ответ:
The answer is the second one from the top so the 1/3 with the 8 on the bottom.
Step-by-step explanation: No