ODE:
Part 1: show that cos7x and sin7x are linearly independent using the Wronskian and Gramian.
Part 2: Find 2 equations for the two unknowns M, N, and solve for M, N.
Part 3: Find the overall solution y(x) that corresponds to the initial conditions:
Plot the solution over 3 periods
Wronskian: Function is linearly independent if
g(x) and f(x) are linearly independent
Gramian: Function is linearly independent if
g(x) and f(x) are linearly independent
The particular solution for a will be:
Differentiate to get:
Plug the derivatives into the equation:
Separate the sin and cos terms to get 2 equations in order to solve for M and N
dividing each equation by cos7x and sin7x respectively:
So the particular solution is:
The overall solution can be found by:
The roots given in the problem statement
Lead to the homogeneous solution of:
Combining the homogeneous and particular solution gives us:
Solving for the constants by using the initial conditions
The overall solution is:
Plot
over 3 periods:
On our honor, we solved this problem on our own, without aid from online solutions or solutions from previous semesters.
Complete the solution to problem on p.8-6.
Find the overall solution
that corresponds to the initial condition
Plot solution over 3 periods.
Given:
Solve for M and N:
Using initial conditions given find A and B
After applying initial conditions, we get
On our honor, we solved this problem on our own, without aid from online solutions or solutions from previous semesters.
Is the given function even or odd or neither even nor odd? Find its Fourier Series.
so is an even function.
The Fourier series is .
For
For
The above integral requires two iterations of integration by parts. Which gives
Similarly, integration by parts needs to be used twice to solve the following integral.
So the Fourier series for is
On our honor, we solved this problem on our own, without aid from online solutions or solutions from previous semesters.
1) Develop the Fourier series of. Plotand develop the truncated Fourier series.
for n = 0,1,2,4,8. Observe the values of at the points of discontinuities, and the Gibbs phenomenon. Transform the variable so to obtain the
Fourier series expansion of . Level 1: n=0,1.
2)Do the same as above, but usingto obtain the Fourier series expansion of; compare to the result obtained above. Level 1: n=0,1.
To begin, the function was determined to be even. Even functions reduce to a cosine Fourier series.
Because , has a period of 4, the length is 2.
For n=0,
For n=1,
Plot (A=1)
To begin, the function was determined to be odd. Even functions reduce to a sine Fourier series.
Because , has a period of 4, the length is 2.
from 0 to 4
from 0 to 4
For n=0,
For n=1,
Plot (A=1)
On our honor, we solved this problem on our own, without aid from online solutions or solutions from previous semesters.
Find the separated ODE's for the Heat Equation:
(1)
heat capacity
Separation of Variables:
Assume:
(2)
(3)
(4)
(5)
Plug (2) and (3) into Heat Equation (1):
(6)
Rearrange (6) to combine like terms:
Solution:
Separated ODE's for Heat Equation:
On our honor, we solved this problem on our own, without aid from online solutions or solutions from previous semesters.
Verify (4)-(5) p.19-9
(4) for
(5) for
Using the integral scalar product calculation,
Substituting in sin values,
Using and
You can substitute z into the integral instead of x.
Integrating,
from to
Since , the equation with its sin values turns into 0-0=0
You can use the same equation from the verification of (4) from this point:
from to
Putting those values in and substituting L back in the equation, it turns into
On our honor, we solved this problem on our own, without aid from online solutions or solutions from previous semesters.
Plot the truncated series for n=5.
C=3 and L=2
Plot
Plot
Plot
Plot
On our honor, we solved this problem on our own, without aid from online solutions or solutions from previous semesters.