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Ariel Sheep Herding - Timelapse
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Beautiful Trigonometry - Numberphile
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4 Revolutionary Riddles
ChaosEngineThis line is incorrect Vavg = (V1+V2)/2. That only applies if you run at V1 and V2 FOR THE SAME AMOUNT OF TIME.
)
Speed is Distance divided by Time, so the formula for calculating average speed is Dtotal / Ttotal.
The problem is that that only works if your second lap can be longer than the first lap.
If they are the same distance, the maths are undefined.
V1 = D1/T1
V2 = D2/T2
Vavg = (D1+D2)/(T1+T2)
if (D1 = D2) then
Vavg = 2D1/(T1+T2)
if Vavg = 2V1 then
2D1/T1 = 2D1/(T1+T2)
then T2 = 0
therefore V2 = D1/0 .... cannot divide by 0 (and no, it's not infinity
The track question seems really straightforward. The question is how fast do you have to run the 2nd lap such that the average of the two laps (Vavg) is twice the velocity of the 1st lap (2V1); so Vavg = 2V1 (says right in the video). Unless I'm missing something, V2 has to equal 3V1:
Since the problem states that Vavg must be 2V1, we can substitute that in the average calculation below:
So, Vavg = (V1+V2)/2 becomes 2V1 = (V1+V2)/2
Now solve for V2:
V2 = 4V1-V1
of
V2 = 3V1
i.e. your 2nd lap must always be 3x faster than your 1st lap so that the average of the two laps is twice the velocity of the 1st lap.
No?
For example:
V1 = 1 m/s
V2 = 3 m/s
Vavg = 2 m/s
2m/s = 2V1
V1 = 5m/s
V2 = 15m/s
Vavg = 10m/s or 2V1.
The (red) button
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Dorkly Bits: Teenage Mutant Ninja Turtles Argue Over Pizza
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Homeless Man Sees 'Do Gooder' Video For What It Is
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glenn greenwald-how to be a media "terror expert"
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CBS: Jon Stewart Is Right
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A hunt for the origins of familiar Chinese-American dishes.
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Toy Lightsaber
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The many wonders of light art photography
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Climate 101
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garbage-blood for poppie
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Russian Women Cat Fight Over Dog Poop
Fantomas>> ^mxxcon:
It's a video for some #уберизадругом (убери за другом) (clean up after a friend) competition/campaign.
I guess they want some funny videos of pointing out where people throw garbage(or dog shit) on the street or otherwise make Moscow(or Russia?) dirty.
btw https://www.google.com/search?q=i
2;ария+Ивакова is the owner of that youtube channel.
How disappointing. I preferred thinking that this was some kind of obscure pornography.
Zero Punctuation: Diablo 3
KrupoAh the amusing valiant defense of a game with a mandatory mega-tutorial... yeah, pass on that, haven't even finished Torchlight, don't think I finished D1 either - the introductory comment was so succicnct.