jeffaschwarz's channel
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1 week ago
New York Groove-Ace Frehley
this is from the Ace Frehley solo album with KISS.
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1 week ago
Flight 1549 3D Reconstruction, Hudson River Ditching Jan 15, 2009
Full info: http://www.exosphere3d.com/... This animation is based on all currently availabl...
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1 week ago
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1 month ago
A Swarm of Nano Quadrotors
Experiments performed with a team of nano quadrotors at the GRASP Lab, University of Pennsylvania. Vehicles developed by KMel Robotics. Special t...
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3 months ago
Drivelapse USA - 5 Minute Roadtrip Timelapse Around America
American Roadtrip Timelapse / Drivelapse video from my 12,225 mile cross country roadtrip around the USA from August 2011 - October 2011 compressed...
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8 months ago
Multiplying and Simplifying Rational Expressions
u15_l1_t2_we1 Multiplying and Simplifying Rational Expressions
jeffaschwarz
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9 months ago
The Fourier Transform- Part I
A short tutorial video on how the Fourier Transform works. The video is designed for those who know what a Fourier Transform is but need to underst...
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9 months ago
jeffaschwarz
commented:
I have an issue with your use of Euler's at 3:17 in the vid. Unless I misunderstand, you are suggesting that A and B (the coefficients of cos and sin on rhs) may not be equal. However, e^{jt}=cos(t)+j sin(t), which means that Me^{jwt}=M cos(wt) + j M sin(wt). A and B must equal M (A=B=M). No?
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9 months ago
How to Write a Scientific Research Paper- part 3 of 3
This is a (sometimes) tongue-in-cheek look at how to write a scientific research paper that is given as part of a graduate student seminar at Oklah...
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9 months ago
Trig identities part 2 (parr 4 if you watch the proofs)
More playing around with trig identities
jeffaschwarz
commented:
Around 1:20 you seem confused about why there is a secant and cosecant. The reason for that is because raising sine and cosine to the negative first power (sin^-1 or cos^-1), which would normally represent 1/sin and 1/cos, are used instead to indicate the inverse functions arcsine and arccosine.
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9 months ago
Maclauren and Taylor Series Intuition
Approximating a function at 0 using a polynomial
jeffaschwarz
commented:
Got a vid on the radius of convergence?
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9 months ago
The Pythagorean Theorem
Introduction to the Pythagorean Theorem
jeffaschwarz
commented:
One tip when teaching beginners to take square roots (as in this video around 10 min.), after factoring the radicand, is to cross out every duplicated factor and put one on the outside.
IOW: sqrt(108)=sqrt(2*2*3*3*3)=2*3*sqrt(3)=6*sqrt(3). There were two 2s and two 3s under the radical sign, I c...
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9 months ago
Angle Game (part 2)
More examples of the Angle Game.
jeffaschwarz
commented:
There is a right answer. There is not a right way to get to the answer.
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10 months ago
How to Do Math In Your Head : Quick Math Tricks: Squaring Two Digit Numbers Ending in 5
Learn how to square two digit numbers ending in 5 in your head in this free video series. Get mental math tips from these online tutoring lessons.
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jeffaschwarz
commented:
I don't think this works all the time:
This method: 74^2=(7)(8)=56 and add 16 on the end is 5616.
But 74^2=5476.
I suspect this will work for numbers that end in 5, but the video does not specify that.
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1 year ago
ILLUMINATI EXPOSED - RESIST OPPRESSION pt4
ILLUMINATI EXPOSED - RESIST OPPRESSION pt4
A documentary explaining and exposing the ways of the Illuminati. Please pay close attention to these ...
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1 year ago
Salman Khan talk at TED 2011 (from ted.com)
Salman Khan talk at TED 2011 (from ted.com)
jeffaschwarz
commented:
I have said several time that the the reason SK is such a good lecturer is because he has a pause (and rewind) button.
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1 year ago
Molly Hatchet: Flirtin With Disaster
Artist: Molly Hatchet
Song: Flirtin With Disaster
Album: Flirtin With Disaster
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1 year ago
Deep Purple Smoke On The Water (lyrics)
This is to Deep Purple's Smoke On The Water with lyrics
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1 year ago
The Revolution Will Not Be Televised - Gil Scott-Heron
A collage of Youtube clips to the original recording from Gil Scott Heron's classic first album.
Please rate & share - and Check out other stuff o...
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1 year ago
Gun Fight Caught on Tape
Police released surveillance video to identify gunmen captured on camera at Route 66 Bar in Toledo, Ohio. The shootout involved multiple gunmen.
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1 year ago
Minli Virdone
Informal conversation with Minli (I know. I need a tripod)
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1 year ago
Phish-Bouncing Around The Room(With Lyrics)
Lyrics
the woman was a dream I had
though rather hard to keep
for when my eyes were watching hers, they closed, and I was still asleep
for when ...
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About jeffaschwarz's channel
Simplify the numbers first, then multiply. You get smaller numbers and make fewer mistakes. Simplify by factoring the numbers and then cross out top and bottom matching numbers.