## ODE’s

This is Differential Equations work. (Mathematics)

This is not a writing assignment.

The assignment is for my use, to review from, but I am having problems with the work and the Professors are not available.
I am hoping a different way of looking at the work will trigger my understanding.
I would appreciate any explanations / steps that could be included on the problems.

You MUST know Differential Equations to do this work.

## Geotech Civil Engineering

A soil boring log was taken from a site where the construction of a 3-story office building is planned. It is anticipated that a column load of 90 kips will rest on a 6 ft x 6 ft footing which is embedded 2 ft below the ground surface. Assume a groundwater elevation at EL. 142.40 ft.

A) Use SPT correlations from legitimate sources to estimate the unit weight of each soil layer identified in the boring log to an elevation of 108 ft (i.e. to the top of the thin limestone layer). One such source is http://www.geotechnicalinfo.com/soil_unit_weight.html, but feel free to explore other sources. Report your assigned values in a table.

B) Plot the total and effective stress distributions to the top of the thin limestone layer (EL. 108 ft).

C) Plot the change in vertical stress as a result of the square footing (to EL. 108 ft).

D) Plot the final stress (initial effective stress plus change).

The deliverables should include the following:

· a table detailing assigned unit weights for each layer (must reference sources);

· plot of total and effective stress on the same graph;

· plot of stress increase resulting from the footing;

· plot of the final stress and initial effective stress on the same graph; and

· appendix with hand/sample calculations (either typed on plain white paper or handwritten on engineering paper).

## 8 9 10 Disaster Recovery- Information Management Systems

Chapter 8: Commercializing emerging technologies through complementary assets

1) Describe three challenges of commercialization (200 words)

2) Describe in a few words the hurdles of emerging technologies. (200words)

Chapter9: Disciplined imagination: strategy making in uncertain environments

1) Describe twin pillars of strategy: Discipline and Imagination (200 words)

2) Describe the challenges of disciplined imagination? (200 words)

Chapter 7: Scenario planning for disruptive technologies

1) Describe the power of scenario planning (200 words)

2) Describe unbundling of information and advertising (200 words)

APA format, 1 reference per question and no plagiarism.

## MATLAB help..

DSP First, 2e Signal Processing First

Lab P-4: AM and FM Sinusoidal Signals

Pre-Lab and Warm-Up: You should read at least the Pre-Lab and Warm-up sections of this lab assignment and go over all exercises in the Pre-Lab section before going to your assigned lab session.

Verification: The Warm-up section of each lab must be completed during your assigned Lab time and the steps marked Instructor Verification must also be signed off during the lab time. One of the laboratory instructors must verify the appropriate steps by signing on the Instructor Verification line. When you have completed a step that requires verification, simply demonstrate the step to the instructor. Turn in the com- pleted verification sheet to your instructor when you leave the lab.

Lab Report: Write a lab report on Section 4 with graphs and explanations. Please label the axes of your plots and include a title for every plot. In order to keep track of plots, include each plot inlined within your report. If you are unsure about what is expected, ask the instructor who will grade your report.

1 Introduction

The objective of this lab is to introduce more complicated signals that are related to the basic sinusoid. These signals, which implement frequency modulation (FM) and amplitude modulation (AM), are widely used in communication systems such as radio and television, but they also can be used to create interesting sounds that mimic musical instruments. There are a number of demonstrations on the companion website that provide examples of these signals for many different conditions, e.g., the demo of FM Synthesis in Chapter 3.

2 Pre-Lab

We have spent a lot of time learning about the properties of sinusoidal waveforms of the form:

x.t/D Acos.2�f0tC’/D< n Aej’ej 2�f0t

o (1)

In this lab, we will extend our treatment of sinusoidal waveforms to more complicated signals composed of sums of sinusoidal signals, or sinusoids with changing frequency.

2.1 Amplitude Modulation

If we add several sinusoids, each with a different frequency .fk/ we can express the result as:

x.t/D

NX kD1

Ak cos.2�fktC’k/D<

( NX

kD1

.Ake j’k /ej 2�fkt

) (2)

where Ake j’k is the complex amplitudeof the kth complex exponential term. The choice of fk will deter-

mine the nature of the signal—for amplitude modulation or beat signals we pick two or three frequencies very close together. See Chapter 3 for a more detailed discussion of beat signals.

McClellan, Schafer, and Yoder, DSP First, 2e, ISBN 0-13-065562-7. Prentice Hall, Upper Saddle River, NJ 07458. c 2015 Pearson Education, Inc.

1 McClellan, Schafer and Yoder, Signal Processing First. Prentice Hall, Upper Saddle River, New Jersey, 2003. c 2003 Prentice Hall.

2.2 Frequency Modulated Signals

We will also look at signals in which the frequency varies as a function of time. In the constant-frequency sinusoid (1) the argument of the cosine is also the exponent of the complex exponential, so the angle of this signal is the exponent .2�f0tC’/. This angle function changes linearly versus time, and its time derivative is 2�f0 which equals the constant frequency of the cosine in rad/s.

A generalization is available if we adopt the following notation for the class of signals represented by a cosine function with a time-varying angle:

x.t/D Acos. .t//D<fAej .t/g (3)

The time derivative of the angle from (3) gives a frequency in rad/s

!i .t/D d

but we prefer units of hertz, so we divide by 2� to define the instantaneous frequency:

fi .t/D 1

2�

d

dt .t/ (Hz) (4)

2.3 Chirp, or Linearly Swept Frequency

A chirp signal is a sinusoid whose frequency changes linearly from a starting value to an ending one.1 The formula for such a signal can be defined by creating a complex exponential signal with quadratic angle by defining .t/ in (3) as

.t/D 2��t2C2�f0tC’

The derivative of .t/ yields an instantaneous frequency (4) that changes linearly versus time.

fi .t/D 2�tCf0

The slope of fi .t/ is equal to 2� and its intercept is equal to f0. If the signal starts at time t D 0 secs., then f0 is also the starting frequency. The frequency variation produced by such a time-varying angle is called frequency modulation. This kind of signal is an example of an frequency modulated (FM) signal. More generally, we often consider them to be part of a larger class called angle modulation signals. Finally, since the linear variation of the frequency can produce an audible sound similar to a siren or a chirp, the linear-FM signals are also called “chirps.”

2.4 MATLAB Synthesis of Chirp Signals

The following MATLAB code will synthesize a chirp:

fsamp = 11025; dt = 1/fsamp; dur = 1.8; tt = 0 : dt : dur; psi = 2pi(100 + 200tt + 500tt.tt); xx = real( 7.7exp(j*psi) ); soundsc( xx, fsamp );

1There is a demo on the companion website called Spectrograms & Sounds: Wideband FM.

McClellan, Schafer, and Yoder, DSP First, 2e, ISBN 0-13-065562-7. Prentice Hall, Upper Saddle River, NJ 07458. c 2015 Pearson Education, Inc.

2 McClellan, Schafer and Yoder, Signal Processing First. Prentice Hall, Upper Saddle River, New Jersey, 2003. c 2003 Prentice Hall.

(a) Determine the total duration of the synthesized signal in seconds, and also the length of the tt vector (number of samples).

(b) In MATLAB, signals can only be synthesized by evaluating the signal’s defining formula at discrete instants of time. These are called samples of the signal. For the chirp we do the following:

x.tn/D Acos.2��t2nC2�f0tnC’/

where tn D nTs represents discrete time instants. In the MATLAB code above, what is the value for tn? What are the values of A, �, f0, and ‘?

(c) Determine the range of frequencies (in hertz) that will be synthesized by the MATLAB script above. Make a sketch by hand of the instantaneous frequency versus time. What are the minimum and maximum frequencies that will be heard?

(d) Listen to the signal to determine whether the signal’s frequency content is increasing or decreasing (use soundsc()). Notice that soundsc() needs to know the sampling rate at which the signal samples were created. For more information do help sound and help sound().

3 Warm-up

The instructor verification sheet may be found at the end of this lab.

3.1 Beat Control GUI

To assist you in your experiments with beat notes and AM signals, the tool called beatcon has been created.2

This user interface controller will exhibit the basic signal shapes for beat signals and play the signals. A small control panel will appear on the screen with buttons and sliders that vary the different parameters for the beat signals. It can also call a user-written function called beat.m. Experiment with the beatcon control panel and use it to produce a beat signal with two frequency components at 850 Hz and 870 Hz. Demonstrate the plot and sound to your instructor.

Instructor Verification (separate page)

3.2 Function for a Chirp

Use the code provided in the warm-up as a starting point in order to write a MATLAB function that will synthesize a “chirp” signal according to the following comments:

function [xx,tt] = mychirp( f1, f2, dur, fsamp ) %MYCHIRP generate a linear-FM chirp signal % % usage: xx = mychirp( f1, f2, dur, fsamp ) % % f1 = starting frequency % f2 = ending frequency % dur = total time duration % fsamp = sampling frequency (OPTIONAL: default is 11025) %

2The MATLAB M-file beatcon.m is part of the DSP First MATLAB Toolbox.

McClellan, Schafer, and Yoder, DSP First, 2e, ISBN 0-13-065562-7. Prentice Hall, Upper Saddle River, NJ 07458. c 2015 Pearson Education, Inc.

3 McClellan, Schafer and Yoder, Signal Processing First. Prentice Hall, Upper Saddle River, New Jersey, 2003. c 2003 Prentice Hall.

% xx = (vector of) samples of the chirp signal % tt = vector of time instants for t=0 to t=dur % if( nargin < 4 ) %– Allow optional input argument

fsamp = 11025; end

As a test case, generate a chirp sound whose frequency starts at 2500 Hz and ends at 500 Hz; its duration should be 1.5 s. Listen to the chirp using the soundsc function. Include a listing of the mychirp.m function that you wrote.

Instructor Verification (separate page)

It is often useful to think of signals in terms of their spectra. A signal’s spectrum is a representation of the frequencies present in the signal. For a constant frequency sinusoid as in (1) the spectrum consists of two components, one at 2�f0, the other at �2�f0. For more complicated signals, the spectrum may be very interesting and, in the case of FM, the spectrum is considered to be time-varying. One way to represent the time-varying spectrum of a signal is the spectrogram (see Chapter 3 in the text). A spectrogram is found by estimating the frequency content in short sections of the signal. The magnitude of the spectrum over individual sections is plotted as intensity or color on a two-dimensional plot versus frequency and time.3

When unsure about a command, use help.

There are a few important things to know about spectrograms:

2. Spectrograms are numerically calculated and only provide an estimate of the time-varying frequency content of a signal. There are theoretical limits on how well spectrograms can actually represent the frequency content of a signal. A later lab will treat this problem when we use the spectrogram to extract the frequencies of piano notes.
3. A common call to the function is spectrogram(xx,1024,[],1024,fs,’yaxis’). The second ar- gument4 is the window length which is varied to get different looking spectrograms. The spectrogram is able to “distinguish” the separate spectrum lines with a longer window length, e.g., 1024 or 2048.5
4. An alternative to spectrogram() is the function plotspec(xx,fs,)which is loaded if you have installed the DSP First toolbox.

� Notes: The argument list for plotspec has a different order from spectrogram, because plotspec uses an optional third argument for the window length (default value is 256). In addition, plotspec does not use color for the spectrogram display; instead, darker shades of gray indicate larger val- ues with black being the largest. Finally, the amplitude of the display in linear for plotspec, but logarithmic for spectrogram.

3In Chapter 8, there is a Spectrogram GUI called specgramdemo; it is installed as part of the DSP First MATLAB Toolbox. 4The second and fourth arguments specify the window length and FFT length which should be equal for this lab; the third

argument is set equal to the “empty matrix” so that the default value for overlap will be used. 5Usually the window length is chosen to be a power of two, because a special algorithm called the FFT is used in the computa-

tion. The fastest FFT programs are those where the signal length is a power of 2.

McClellan, Schafer, and Yoder, DSP First, 2e, ISBN 0-13-065562-7. Prentice Hall, Upper Saddle River, NJ 07458. c 2015 Pearson Education, Inc.

4 McClellan, Schafer and Yoder, Signal Processing First. Prentice Hall, Upper Saddle River, New Jersey, 2003. c 2003 Prentice Hall.

In order to see what the spectrogram produces, run the following code:

fs=8000; xx = cos(3000pi(0:1/fs:0.5)); specgram(xx,1024,fs); colorbar

or, if you are using plotspec(xx,fs):

fs=8000; xx = cos(3000pi(0:1/fs:0.5)); plotspec(xx,fs,1024); colorbar

Notice that the spectrogram image contains one horizontal line at the correct frequency of the sinusoid.

4 Lab Exercise: Chirps and Beats

For the lab exercise and lab report, you will synthesize some AM and FM signals. In order to verify that they have the correct frequency content, you will use the spectrogram. Your lab report should discuss the connection between the “time-domain” definition of the signal and its “frequency-domain” content.

4.1 Beat Notes

In the section on beat notes in Chapter 3 of the text, we analyzed the situation in which we had two sinusoidal signals of slightly different frequencies; i.e.,

x.t/D Acos.2�.fc �f/t/CB cos.2�.fcCf/t/ (5)

In this part, we will compute samples of such a signal and listen to the result.

(a) Write an M-file called beat.m that implements (5) and has the following as its first lines:

function [xx, tt] = beat(A, B, fc, delf, fsamp, dur) %BEAT compute samples of the sum of two cosine waves % usage: % [xx, tt] = beat(A, B, fc, delf, fsamp, dur) % % A = amplitude of lower frequency cosine % B = amplitude of higher frequency cosine % fc = center frequency % delf = frequency difference % fsamp = sampling rate % dur = total time duration in seconds % xx = output vector of samples %–Second Output: % tt = time vector corresponding to xx

Include a copy of your M-file in your lab report. You might want to call the syn_sin() function written in Lab 2 to do the calculation. The function should also generate its own time vector, because that vector can be used to define the horizontal axis when plotting.

(b) To assist you in your experiments with beat notes, a tool called beatcon has been created. This user interface controller is able to call your function beat.m, if you check the box Use External beat() in the lower left-hand corner of the GUI. Therefore, before you invoke beatcon you should be sure your M-file is free of errors. Also, make sure that your beat.m function is on the MATLAB path.

McClellan, Schafer, and Yoder, DSP First, 2e, ISBN 0-13-065562-7. Prentice Hall, Upper Saddle River, NJ 07458. c 2015 Pearson Education, Inc.

5 McClellan, Schafer and Yoder, Signal Processing First. Prentice Hall, Upper Saddle River, New Jersey, 2003. c 2003 Prentice Hall.

Test the M-file written in part (a) via beatcon by using the values A=10, B=10, fc=1000, delf=10, fsamp=11025, and dur=1 s. Plot the first 0.2 seconds of the resulting signal. Describe the waveform and explain its properties. Hand in a copy of your plot with measurements of the period of the “envelope” and period of the high frequency signal underneath the envelope.

(c) (Optional)6 Experiment with different values of the frequency difference f. Listen to the sounds (there is a button on beatcon that will do this for you automatically) and think about the relationship between the sound and waveform.

4.2 More on Spectrograms

Beat notes provide an interesting way to investigate the time-frequency characteristics of spectrograms. Although some of the mathematical details are beyond the reach of this course, it is not difficult to appreciate the following issue: There is a fundamental trade-off between knowing which frequencies are present in a signal (or its spectrum) and knowing how those frequencies vary with time. As mentioned previously in Section 3.3, a spectrogram estimates the frequency content over short sections of the signal. If we make the section length very short we can track rapid changes in the frequency. However, shorter sections lack the ability to do accurate frequency measurement because the amount of input data is limited. On the other hand, long sections can give excellent frequency measurements, but fail to track frequency changes well. For example, if a signal is the sum of two sinusoids whose frequencies are nearly the same, a long section length is needed to “resolve” the two sinusoidal components. This trade-off between the section length (in time) and frequency resolution is equivalent to Heisenburg’s Uncertainty Principle in physics.

When AD B in (5), the beat signal can be expressed as

x.t/D Acos.2�.fc �f/t/CAcos.2�.fcCf/t/D AŒcos.2�ft /cos.2�fct /

Therefore, a beat note signal may be viewed as two signals with different constant frequencies, or as a single frequency signal whose amplitude varies with time. Both views will be useful in evaluating the effect of window length when finding the spectrogram of a beat signal.

(a) Create and plot a beat signal with

(i) f D 32 Hz

(ii) Tdur D 0:26 s

(iii) fs D 11025 Hz

(iv) fc D 2000 Hz

(b) Find the spectrogram using a window length of 2048 using the commands: spectrogram(x,2048,[],2048,fsamp); colormap(1-gray(256)).

Comment on what you see. Are the correct frequencies present in the spectrogram? If necessary, use the zoom tool to examine the important region of the spectrogram.

(c) Find the spectrogram using a window length of 16 using the commands: spectrogram(x,16,[],16,fsamp); colormap(1-gray(256)).

Comment on what you see, and compare to the previous spectrogram. 6Optional means that you do not have to include this in your lab report.

McClellan, Schafer, and Yoder, DSP First, 2e, ISBN 0-13-065562-7. Prentice Hall, Upper Saddle River, NJ 07458. c 2015 Pearson Education, Inc.

6 McClellan, Schafer and Yoder, Signal Processing First. Prentice Hall, Upper Saddle River, New Jersey, 2003. c 2003 Prentice Hall.

4.3 Spectrogram of a Chirp

Use the mychirp function (written during the Warm-up) to synthesize a chirp signal for your lab report. Use the following parameters:

1. A total time duration of 3 s, with a D/A conversion rate of fs D 11025 Hz.
2. The instantaneous frequency starts at 5,000 Hz and ends at 300 Hz.

Listen to the signal. What comments can you make regarding the sound of the chirp (e.g., is the frequency movement linear)? Does it chirp down, or chirp up? Create a spectrogram of this chirp signal, and use it to verify that you have the correct instantaneous fre- quencies.

4.4 A Chirp Puzzle

Synthesize a second “chirp” signal (for your lab report) with the following parameters:

1. A total time duration of 3 s, with a sampling rate of fs D 11025 Hz.
2. The instantaneous frequency starts at 3,000 Hz and ends at �2;000 Hz (negative frequency).

Listen to the signal. Does it chirp down, or chirp up, or both? Create a spectrogram of this second chirp signal. Use the theory of the spectrum (with its positive and negative frequency components) to help explain what you hear and what you see in the spectrogram. In other words, the changing instantaneous frequency implies that the frequency components in the spectrum are moving.

McClellan, Schafer, and Yoder, DSP First, 2e, ISBN 0-13-065562-7. Prentice Hall, Upper Saddle River, NJ 07458. c 2015 Pearson Education, Inc.

7 McClellan, Schafer and Yoder, Signal Processing First. Prentice Hall, Upper Saddle River, New Jersey, 2003. c 2003 Prentice Hall.

Lab: AM and FM Sinusoidal Signals INSTRUCTOR VERIFICATION SHEET

Name: Date of Lab:

Part 3.1 Demonstrate usage of the Beat Control GUI.

Verified: Date/Time:

Part 3.2 Demonstrate the mychirp.m function. In the space below write how you would call the function with a correct set of arguments.

Verified: Date/Time:

McClellan, Schafer, and Yoder, DSP First, 2e, ISBN 0-13-065562-7. Prentice Hall, Upper Saddle River, NJ 07458. c 2015 Pearson Education, Inc.

8 McClellan, Schafer and Yoder, Signal Processing First. Prentice Hall, Upper Saddle River, New Jersey, 2003. c 2003 Prentice Hall.

## Forecasting Project

Introduction:

The GEA supported entertainment events trend in Jeddah is an almost new trend that was introduced around mid 2017 and took off at around December 2017. The trend is ruled by different factors. The most important factor is the time of year. The season of these type of entertainment events is estimated to be from November – June, which are the dates that the weather is bearable in Jeddah. The 2017/2018 season anticipated very high demand. The demand peeked around January – February.

Objective:

The 2018/2019 season of entertainment events is soon to start. The purpose of this project is to forecast demand of events this upcoming season. Multiple factors have changed by the previous year, Factors include:

1. Possibility of trend decline

2. Introduction of new trends

3. Cinema opening

4. Saudi innovation

5. Increase of supply and variety

Company selected:

The forecast will be done on levels company, which is a local entertainment events company in Jeddah. Event chosen is “Enchanted”, which will be the company’s 3rd event so far. Launching at the 14th of November, the event will be kicking off the 2018/2019 season by hosting the first large event.

Data:

The forecast will be using data from large successful events of the previous year. The data looked into will be most importantly the number of attendance, the number of events on the same day, the number of events of the week before and after, and also entertainment alternatives other than events, comparing them with this year.

 Event Attendance Ticket Price Other Events the same day Events The previous week Vintage 6800 150 0 0 Glow 4000 100 2 1 Rise Up 7500 100 1 0 Takya 6500 80 1 1

Forecast:

The forecast will using the above data as a reference including changing factors for this upcoming, which we seek to find:

1. Demand forecast for the upcoming event.

2. Demand forecast for the upcoming year.

Post event:

By the end of November 2018, data about event “enchanted” will be acquired, data collected from that event will be an accuracy reference to how well the forecast was made. If data collected can relate to the forecast, we can build a tangible hypothesis about the upcoming season and maybe about the trend and its direction.

## Mechanics

ME 321 Kinematics Exam 1 Retake Name: Student ID: Signature:

Prob. 1 (10 points) Angular velocity of link 2 ω2 = 5 rad/s CCW. Find ω2 and Vp. Use the complex-

algebra method (no credit for other method).

AC = BC = 20 mm, AB = 10 mm, PB = 35 mm.

𝑑(𝑅𝑒𝑗𝜃)

𝑑𝑡 =

𝑑𝑅

𝑑𝑡 𝑒𝑗𝜃 + 𝑗𝑤𝑅𝑒𝑗𝜃 𝑒𝑗𝜃 = 𝑐𝑜𝑠𝜃 + 𝑗𝑠𝑖𝑛𝜃

ret ak

e

Prob. 2 (14 points) All dimensions are known in mm (not to scale). BD = 11.67 mm, AB = 2 mm, AE = 3

mm, ED = 14 mm. link 2 (Link AE) is rotating CW with an angular velocity of 8 rad/s. (1) (4 points) Find

out the number of links and joints (mark the links and joints on figure), calculate degree of freedom m =

3 * (n-1) – 2*J1 – J2 . (2) (8 points) Find the angular velocity of link 4 (link FCD), (3) (2 points) Draw

point B3 on the velocity polygon (show steps to find B3, by relating to its neighbor). Draw the velocity

polygon to solve this problem. Show the intermediate steps to get full credit. Use a scale of 1 mm on

paper represents 1 mm/s. (or if you are using an inch ruler: 1 inch on paper represents 24 mm/s). The

black dot is the origin point in the velocity polygon. Velocity difference equation: VPQ = ω x RPQ, relative

velocity: VB3 = VB4 + VB3/4

ret ak

e

Prob. 3 (10 points)

All dimensions (not to scale) are known in mm.

Vc = 10 m/s to the left.

Find the instantaneous velocity of

point D and the angular velocity of

Scale: 40 mm represents 10 m/s.

(or 1 inch on paper represents

5 m/s) Show all steps.

Ov

ret ak

e

## Powerpoint Presentation (Introduction To Sensors) Electrical Eng

I’m doing mechanical engineering and this subject is electric , all the requairment is provided in the attachment.

All the resource must be taken from the file that is posted in the attachment file name; Fundamentals of sensing.pdf.

If u really need more resource here are some links,

List of website resources.

Rockwell Automation

http://www.ab.com/en/epub/catalogs/12772/6543185/12041221/12041225/Sensor-Application-Basics.html

http://blog.wika.com/knowhow/switching-function-hysteresis-pressure-switch/

## Ergo Six

##### Instructions

This assignment provides you with an opportunity to select an alert system, research it, and evaluate its quality and usability from an ergonomics perspective. First, identify an alert system. It can be an everyday system, or it can be one used at your workplace. Second, research the details of the alert system by using at least one resource in the *** Online Library. You can include credible resources from the Internet, but be sure to include at least one from the *** Online Library. Third, after effectively collecting all of the information about the system, evaluate its quality and usability from an ergonomics perspective. Prepare a 10-slide PowerPoint presentation with your results, and the presentation should include each of the following:

• Briefly describe the alert system and the setting.
• Briefly explain the purpose of the system.
• Briefly explain what triggers the alarm.
• Briefly explain how the employee should respond once the alarm triggers.
• Briefly explain how human variability impacts the design of displays and controls.
• Provide your analysis of quality.
• Provide your analysis of usability.
• (Not required) If you feel the system could be improved, explain how.

Include a title slide and references slide; however, they do not count toward the total slide count. Use APA Style for all in-text and reference citations. Save all of your work, and submit it in Blackboard for grading.

## Non

note: you need to know how to drive the equation and use 20-sim 4.7 software.

i attached two files. one is an example of old assignment so you can take a look at it to understand little bit about the cores if you need.

second file is the actually assignment that you need to answer every part and put it in work doc include what it ask like the equation part and the 20 sim simulation.