Differential Equations: Newton's Law of Cooling: Example 1
In this video I go over a pretty interesting example on Newton's Law of Cooling and model the change in temperature of a bottle of soda pop that is placed into a refrigerator. This is a great example to illustrate how an object cools when there is a temperature difference between it and its surrounding environment. Also in this example, I illustrate how the soda pop bottle's temperature eventually cools until it is the exact same as the refrigerator temperature, which makes physical sense. This is a pretty extensive example, but nonetheless very helpful in understanding how to apply differential equations to model real world applications, and in this specific case you can actually easily do an experiment by placing your own bottle inside the fridge and measuring the temperature change with time. Try that out for yourself and see if it fits your model!
In this video I go over an example on determining the distance between two parallel planes. The first step is to find a point on one of the planes and then next is to simply apply the distance formula between a point to a plane that I derived in my earlier video. I also double check the distance by calculating it using the amazing GeoGebra 3D graphing calculator, which you can play around with here: https://www.geogebra.org/calculator/zmwhau8b
The timestamps of key parts of the video are listed below:
- Example 9: Distance Between Parallel Planes: 0:00
- Applying the Distance Formula from a Point to a Plane: 1:57
- Calculating Distance with GeoGebra 3D Graphing Calculator: 6:35
This video was taken from my earlier video listed below:
- Equations of Lines and Planes: https://youtu.be/qWQz6qPhXR8
- Video notes: https://peakd.com/hive-128780/@mes/equations-of-lines-and-planes
- Playlist: https://www.youtube.com/playlist?list=PLai3U8-WIK0FO3u0IupqllNNkZTsffpIV
Related videos:
Vectors and the Geometry of Space video series: https://www.youtube.com/playlist?list=PLai3U8-WIK0FjJpwnxwdrOR7L8Ul8VZoZ .
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https://www.youtube.com/watch?v=9B8bUqX5YHg
In this video, I go through a general proof of the Fundamental Theorem of Calculus which states that the derivative of an integral is the function itself. This is one of the most important theorems in all of mathematics so it is important to understand the proof of it.
Download the notes in my video: https://www.dropbox.com/s/v8mxml8ix1iky19/225%20-%20Fundamental%20theorem%20of%20Calculus%20-%20Proof%20of%20Part%201.pdf
Related Videos:
Fundamental Theorem of Calculus - Introduction and Part 1 of the Theorem: http://youtu.be/3o8Q6UJzJyk
Fundamental Theorem of Calculus - Intro and Proof of Part 2 of the Theorem: http://youtu.be/yuIl-BPQHss
The Definite Integral - Brief Introduction: http://youtu.be/vhMP5SKbQjU
Properties of Definite Integrals - Part 1: http://youtu.be/XAel-Zti_Hs
Properties of Definite Integrals - Part 2: http://youtu.be/lxkQmB11qoU
Continuity and Open and Closed Intervals: http://youtu.be/u29fd3WYT-g
Definition of Derivative Simple Explanation: http://youtu.be/0rjGMpM06Eg
Integrals and AntiDerivatives - Area Example: http://youtu.be/Q2PTVZBzMWQ .
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https://www.youtube.com/watch?v=CAqTwiPxYwU
In this video I go over another example on solving separable equations and this time look at the differential equation: dy/dx = 6x^2/(2y + cosy). In this particular example, determining the solution explicitly in terms of y as a function of x is actually impossible so the best that we can do is solve it implicitly, that is an equation that contains y and x but no derivatives. But luckily, there are many computer algebra systems and calculators that can still graph solutions to implicit equations. One of them is https://kevinmehall.net/p/equationexplorer/ and I suggest you check it out because it is a very cool and powerful online graphing calculator!
Download the notes in my video: https://1drv.ms/b/s!As32ynv0LoaIhsoqNJyJEy-6578eRw
View Video Notes on Steemit: https://steemit.com/mathematics/@mes/differential-equations-separable-equations-example-2
Related Videos:
Differential Equations: Separable Equations: Example 1: https://youtu.be/Fhz2o9ZVOjQ
Differential Equations: Separable Equations: https://youtu.be/pBV-xT9ty94
Differential Equations: Euler's Method: Example 2: https://youtu.be/-4qb_mniDR0
Differential Equations: Euler's Method: Example 1: https://youtu.be/L_l5DLZsZLQ
Differential Equations: Electric Circuit: Introduction: https://youtu.be/E6vij-RzQ-o
Differential Equations: Direction Fields: Example 1: https://youtu.be/mtbMQQZeMoQ
Differential Equations: Direction Fields: https://youtu.be/zWv1y8Xp1ac
Differential Equations: General Overview: https://youtu.be/jit59tIY4UI
Differential Equations: Spring Motion: Example 1: https://youtu.be/Twu30EJ93Wg
Differential Equations: Motion of a Spring: https://youtu.be/mk2TiR5dwVs
Differential Equations: Population Growth: https://youtu.be/Td8C_cTEGkA .
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https://www.youtube.com/watch?v=jVVTmkfBe48
A few weeks ago my YouTube Channel was suspended for no apparent reason. Luckily I got my YouTube Channel reinstated because it did not violate any of YouTube's or Google's Policies. In this video I go over how to get back on YouTube through the YouTube Account Termination Appeal Process. I also go over some tips to make sure that your videos are still showing on either your blog or website if your YouTube Channel does get suspended.
Appeal Form: http://support.google.com/youtube/bin/request.py?&contact_type=accountdisabled
Download the notes in my video: https://1drv.ms/b/s!As32ynv0LoaIg4hxWferAHIHDVRKAw
Related Videos:
How to fake the amount of YouTube Subscribers with Google Chrome!! ;): http://youtu.be/Jxo23pJApl4
Loop YouTube Videos with InfiniteLooper.com: http://youtu.be/Rnyxs1ntJMw
YouTube Video Manager Bulk Editing and New Line Trick: http://youtu.be/CBOel2oKaPI .
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https://www.youtube.com/watch?v=9EssKZI4FT0
In this video I go over Question 2 of the Discovery Project: Geometry of a Tetrahedron. This question involves determining the volume of a tetrahedron but in vector coordinate form. The formula of the volume of a tetrahedron is V = 1/3·A·h. To get this formula in vector coordinate form, we can determine the area A of the triangular base as being half the cross product. For the height h, we first have to determine the equation of the plane that contains the area A and then calculate the distance from the opposite vertex to the plane. After going over the equation of a plane and the equation for the distance from a point to the plane, we can thus calculate the volume of a tetrahedron for any set of coordinates. I also graph the tetrahedron using the amazing GeoGebra 3D graphing calculator which also calculates its volume as well which I use as a double check.
The timestamps of key parts of the video are listed below:
- Question 2: 0:00
- Solution to Part (a): 1:11
- The Equation of a Plane: 6:21
- The Distance from a Point to a Plane: 10:33
- Solution to Part (b): 17:31
- Graphing 3D Tetrahedron in GeoGebra: 29:06
This video was taken from my earlier video listed below:
- Discovery Project: The Geometry of a Tetrahedron: https://youtu.be/yRws7Jk2iHU
- Video notes: https://peakd.com/hive-128780/@mes/discovery-project-geometry-of-a-tetrahedron
- Playlist: https://www.youtube.com/playlist?list=PLai3U8-WIK0GoEi9wxl8nTFcfw1ay-_1T .
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In this video I go over part b) of Question 4 of the Applied Project: How Fast Does a Tank Drain? This example continues from my last video, which was part a), and uses the differential equation developed in that video for a spherical water tank, to evaluate the time it takes for the tank to completely drain out of water. Although I don't solve the equation of the water height explicitly, it is still good enough to determine it explicitly as a function of time because it still allows us to evaluate specific heights at specific times. Also in the video I do a lot of calculations by hand as opposed to simply using a calculator, so make sure to watch this video if you want to also see a good exercise in algebra and calculations by hand!
Download the notes in my video: https://1drv.ms/b/s!As32ynv0LoaIhs1KxO8BeFj6I5yykw
View Video Notes on Steemit: https://steemit.com/mathematics/@mes/applied-project-how-fast-does-a-tank-drain-question-4-part-b
Related Videos:
Applied Project: How Fast Does a Tank Drain? Question 4: Part a): https://youtu.be/OyREUg6uCqc
Applied Project: How Fast Does a Tank Drain? Question 4: Introduction: https://youtu.be/9J4QOCi1VbE
Applied Project: How Fast Does a Tank Drain? Question 4: Introduction: https://youtu.be/9J4QOCi1VbE
Applied Project: How Fast Does a Tank Drain? Question 2: https://youtu.be/QtR1QuSNoyk
Applied Project: How Fast Does a Tank Drain? Question 1: https://youtu.be/KhsbeI9QPls
Applied Project: How Rainbows are Formed and the Order of it's Colors : http://youtu.be/Q3Euh4K93_c
Applied Project: How Double Rainbows are formed - Calculus of Rainbows Part 2 : http://youtu.be/bKfyV_YKLR4
Applied Project: The Shape of a Can - The Science behind Can Manufacturing : http://youtu.be/pfpd8RJi9jw
Applied Project: Where Should a Pilot Start Descent?: http://youtu.be/DI4WMqrYB4Q
Applied Project: Building a Better Roller Coaster: http://youtu.be/QjtaMIlKYxQ
Applied Project: Where to Sit at the Movies: http://youtu.be/oEkFJuCE-4A
Addition and Subtraction by Hand - An in-depth look: http://youtu.be/Tkb7xU-lFWU
Multiplication by Hand - In depth look at the wonderful world of multiplication: http://youtu.be/bUKGh5R_0Sw
Long Division by Hand - An in depth look: http://youtu.be/giBZg5Vqryo
Power Functions and their Properties Part 1 - A Simple Explanation: http://youtu.be/2MKko4ZkSf0 .
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https://www.youtube.com/watch?v=v1-HF67u2Xw
In #MESExperiments 14, I demonstrate a very interesting finding that I had not previously suspected with gyroscopes and that is the steepness of the angle of precession has very little direct effect on the rate of precession. Note that in this context I refer to the rate or “period” of precession as the number of precession revolutions per time (in this case per minute hence RPM) and should be distinguished from precessional or angular velocity which is the actual speed of the center of mass moving in precession. This observation of the precession rate being unaffected by the steepness of the angle indicates both that the angular velocity of the center of mass is increasing as the angle is steeper (since the gyro has further distance to precess) but also that there is an underlying symmetry taking place between the gyro spin speed and the rate of precession.
Furthermore, my prior intuition was that the steeper the gyroscope the more “torque” would be imposed which should drive both the precession rate and velocity faster to maintain its (anti-gravitic) levitation. But given my earlier experiments of gyroscopes literally behaving massless in precession, it seems fitting and more reasonable that precession has a much more correlated and direct connection to the spin speed than conventionally understood.
Four gyroscope tests were performed in this experiment and at angles: 31°, 45°, 65°, and 84° from the vertical. The full results are show in the Excel Spreadsheet file and corresponding Steemit Notes.
- Excel File: https://1drv.ms/x/s!As32ynv0LoaIh_F1zEvJGUMvdW_6zw?e=B3X619
- Hive Notes: https://peakd.com/mesexperiments/@mes/mesexperiments-14-angle-of-gyroscope-has-little-effect-on-rate-period-of-precession-interesting
I discuss the data and findings in the Steemit article so make sure to go over it. Interesting findings include the precession rate increases with elapsed time but up to a “peak precession rate” after which the precession rate drops. Since the near horizontal 84° gyro fell down quickly it did not exhibit a typical “peak precession rate” but rather fell at its highest precession rate. This is definitely a subject of further study.
Further discussion of the findings, the links to the original gyro tests, specific data measurements, and weight measurements (the gyro used is 150.68 grams with the stem) are also included in the Steemit post.
Note: I accidentally skipped over the 233 revolutions count for the 65° test but have corrected this in the Excel/Steemit data.
Stay Tuned for #MESExperiments 15…
Related Videos:
#MESExperiments Video Series: https://peakd.com/mesexperiments/@mes/list
DRAFT #MESExperiments Video Series: https://mes.fm/experiments-draft
#AntiGravity Video Series: https://peakd.com/antigravity/@mes/series
#FreeEnergy Video Series: https://mes.fm/freeenergy-playlist .
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In this video I go over another example on calculating the area of polar curves and this time find the area enclosed by a circle yet separated by a cardioid. The Cardioid, or Heart in Greek, is the same formula I had previously graphed in my earlier example video. To save time, I plot both of the graphs together by using the Desmos calculator to obtain the resulting area we need to calculate. The first step in solving for the area is to find the points at which they intersect. From there we can apply the formula for the area of a polar curve which I covered in my earlier video, but this time we solve for the area of a polar circle, and then subtract from it the area of the polar cardioid. This is a very important video in understanding how to go about solving in detail the area enclosed by two polar curves, so make sure to watch this video!
Download the notes in my video: https://1drv.ms/b/s!As32ynv0LoaIhvVAKCYLCqdXeyXJow
View Video Notes on Steemit: https://steemit.com/mathematics/@mes/video-notes-polar-coordinates-area-example-2-cardioid-and-circle
Related Videos:
Polar Coordinates: Area: Example 1: r = cos 2ϴ: https://youtu.be/6kavQyGcODo
Polar Coordinates: Area Formula: https://youtu.be/wd-EwiKzqa0
Polar Coordinates: Graphing With Polar Curves with Desmos Calculator: https://youtu.be/xY9Be9HHRsk
Polar Coordinates: Cartesian Connection: https://youtu.be/HcaTYrpmGaU
Polar Coordinates: https://youtu.be/-KAdZL-N4ok
Parametric Equations and Polar Coordinates: https://youtu.be/usSors49Gdw
Polar Coordinates: Example 7: Cardioid: https://youtu.be/rPErcaqNUIY
Half Angle Trigonometry Identities: http://youtu.be/0bY6tHZhBSI .
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https://www.youtube.com/watch?v=vSzxzNn3EiA
In this video I go over a useful example finding the equation of the tangent line to a curve at a given point. The derivative at that point is the same as the slope of the tangent line and this is used in determining the equation of the tangent line.
Download the notes in my video: https://www.dropbox.com/s/5skw26mheidd56g/381%20-%20Derivatives%20Example%20-%20Tangent%20line%20to%20a%20curve.pdf
Related Videos:
Tangent and Secant Lines: http://youtu.be/9E6fBySBsYw
Equation of Tangent Lines - Examples: http://youtu.be/VqIhcWmCx_Q
Equation of a Line - A Simple Explanation: http://youtu.be/a3ntO-xNN5M
Power Functions and their Properties Part 1 - A Simple Explanation: http://youtu.be/2MKko4ZkSf0 .
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https://www.youtube.com/watch?v=aE28GSn3eek