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# ? Dec 16, 2021 17:26 |
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# ? May 27, 2024 23:30 |
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Amazing It took me at least 4 seconds of staring to get over seeing the pin feathers as horrible teeth.
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# ? Dec 16, 2021 18:26 |
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Lol drat its actually a pigeon. 100% thought it was dark souls fan art or something
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# ? Dec 16, 2021 18:30 |
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Nordick posted:PYF Bad rear end Pictures: Cast All Medals into Spearheads of Revolution
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# ? Dec 16, 2021 19:22 |
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https://www.youtube.com/watch?v=1y2Asd5_ito
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# ? Dec 21, 2021 04:15 |
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heh.... PP.
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# ? Dec 22, 2021 20:06 |
https://i.imgur.com/Ezyqew1.mp4
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# ? Dec 24, 2021 15:36 |
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Wuh? How?
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# ? Dec 25, 2021 18:32 |
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Physics
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# ? Dec 25, 2021 19:54 |
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Panfilo posted:Wuh? How? To maintain a circular trajectory, an object must have an acceleration towards the center of the circle equal to its speed squared divided by the circle's radius (v2/R). If there's too much acceleration, then the car will fall towards the center of the circle (bad news). Let's consider the most dangerous point, the very top of the loop, where gravity points straight towards the center of the circle. There are two sources of acceleration: gravity and the contact force between the car and the track. The contact force can't pull upwards, though, so at the critical threshold where the car barely makes the loop, it will be zero and gravity will be doing all the work. So we can solve the equation g = v2/R, where g is the acceleration due to gravity on Earth's surface (9.8 m/s2 or 32 ft/s2) to find the critical speed v where the car barely is going fast enough to make the loop. Rearranging that equation, we get v = sqrt(g*R). Estimating based on the video that the loop is about 3 and a half car lengths in diameter, and using a value I googled of 4.5m for the length of a car, we get v = sqrt(9.8 m/s2 * 4.5m * 3.5/2) = 8.8 m/s or 19.7 miles per hour. This doesn't sound like much, and it isn't! In practice, they probably want to be going a fair bit faster for a healthy safety margin. However, they've also got the problem that as they rise through the loop, they lose speed, or in other words, some of their kinetic energy is converted into gravitational potential energy. Assuming that they don't either lose speed to friction or gain speed from their engine during the loop (a bad assumption but the two effects will at least partially cancel out), we can use conservation of energy to figure out how fast they should be going at the bottom of the loop. KEbefore + PEbefore = KEafter + PEafter 1/2 m vbefore2 + m g (0) = 1/2 m vafter2 + m g h (We can divide through to cancel the masses; the initial height is zero, the final height will be 3.5 car lengths; the speed after will be our 8.8 m/s.) 1/2 vbefore2 = 1/2 (8.8 m/s)2 + (9.8 m/s2)*(3.5*4.5m) vbefore = sqrt[(8.8 m/s)2 + 2*(9.8 m/s2)*(3.5*4.5m)] which comes out to 19.7 m/s or 44.0 miles per hour. This is all heavily estimated, of course - this is more of an example than a serious analysis of the video. You could get way more accurate measurements if you opened it up in image-editing software and measured pixels and stuff. I did my best to do a quick-and-dirty measure of their speed in the video and I'd say it looks like they were going about 45-55mph at the bottom, which seems like not a lot of margin for error, so probably the circle was a bit smaller than I was estimating, or maybe they get enough of a boost by gunning the engine through the loop itself. Either way, as you can see from these example numbers, it's surprisingly doable. The hardest part is probably getting their insurance company to sign off on this stunt, as if anything goes wrong, you could have someone in a car falling fifty feet, landing with much more force than a car's roll cage is normally meant to handle. So that's probably one good reason why you don't see this stunt done more often - it's surprisingly easy to do, but dangerous as hell. DontMockMySmock has a new favorite as of 02:24 on Dec 29, 2021 |
# ? Dec 25, 2021 21:58 |
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# ? Dec 26, 2021 03:29 |
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Panfilo posted:Wuh? How?
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# ? Dec 26, 2021 11:57 |
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Wisconsin.jpg
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# ? Dec 26, 2021 16:52 |
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Telling the state trooper to kiss her rear end
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# ? Dec 27, 2021 13:01 |
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https://www.instagram.com/reel/CX4-jq6O8v9/?utm_medium=copy_link
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# ? Dec 27, 2021 16:28 |
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DontMockMySmock posted:
Ban this sick filth
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# ? Dec 27, 2021 18:41 |
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DontMockMySmock posted:
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# ? Dec 29, 2021 01:56 |
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Dangit, didn't notice those hosed up square brackets until the second time it was quoted
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# ? Dec 29, 2021 02:25 |
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Nordick posted:PYF Bad rear end Pictures: Cast All Medals into Spearheads of Revolution
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# ? Dec 29, 2021 05:17 |
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DontMockMySmock posted:which comes out to 19.7 m/s or 44.0 miles per hour. I was like "drat, they are going slow as hell for that loop" but I guess it works out just fine
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# ? Dec 29, 2021 15:33 |
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Seriously, the more times I read that line, the cooler it gets. It needs to be immortalized somewhere. I want people a thousand years from now to be citing that poo poo. gently caress.
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# ? Dec 30, 2021 12:54 |
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Nordick posted:PYF Bad rear end Pictures: Cast All Medals into Spearheads of Revolution yeah cmon can we get a title already
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# ? Dec 30, 2021 13:51 |
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While They had surgery on a ape is funny, Cast All Medals into Spearheads of Revolution is straight
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# ? Dec 30, 2021 14:25 |
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Agreed.
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# ? Dec 31, 2021 00:43 |
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also the schadenfreude thread has a ape title now so
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# ? Dec 31, 2021 01:25 |
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Guy making his own robot hand has made a lot of progress https://www.youtube.com/watch?v=PEnj18pKeJM I has a one finger salute setting! -Zydeco- has a new favorite as of 15:07 on Jan 1, 2022 |
# ? Jan 1, 2022 15:04 |
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That is a fantastic variation and adaptation of the Encabulator.
Proteus Jones has a new favorite as of 06:32 on Jan 2, 2022 |
# ? Jan 2, 2022 06:27 |
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Of course his work isn't done until he has a powerfist capable of punching through an ice block.
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# ? Jan 2, 2022 17:56 |
https://twitter.com/SlideJPN/status/1479155653159489539
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# ? Jan 7, 2022 16:44 |
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Well here's a sound I never ever want to hear in real life: an angry King Cobra growling https://i.imgur.com/jsDLEZb.mp4
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# ? Jan 9, 2022 13:05 |
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Sssssssssssssaturn devouring his son
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# ? Jan 9, 2022 15:45 |
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Snowglobe of Doom posted:Well here's a sound I never ever want to hear in real life: an angry King Cobra growling Reminds me of the sound of howler monkeys. It's amazing how fear inducing these primal growls can be.
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# ? Jan 10, 2022 04:31 |
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ACAB, but this is fkn badass https://twitter.com/LAPDHQ/status/1480363436311670784
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# ? Jan 10, 2022 09:12 |
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Is there seriously no way to communicate with trains that there's something on the track up ahead ? Like the emergency stop button on an escalator.
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# ? Jan 10, 2022 10:59 |
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Maximum Sexy Pigeon posted:ACAB, but this is fkn badass Would have been cool and badass if the cops died. Maybe the pilot too, I don't know anything about him but he's old, white, and wealthy enough to own a plane so probably he is at least as racist and stupid as the cops. (USER WAS PUT ON PROBATION FOR THIS POST)
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# ? Jan 10, 2022 11:02 |
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Lady Disdain posted:Is there seriously no way to communicate with trains that there's something on the track up ahead ? Like the emergency stop button on an escalator. Trains are really heavy. That means they take a LONG time to stop. A driver with a lot of warning the still can't stop a train. Nothing can. It's why big trucks get shoved out of the way like they're nothing when they try take on a train.
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# ? Jan 10, 2022 11:28 |
Biplane posted:Would have been cool and badass if the cops died. Maybe the pilot too, I don't know anything about him but he's old, white, and wealthy enough to own a plane so probably he is at least as racist and stupid as the cops. What the gently caress is wrong with you...
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# ? Jan 10, 2022 12:21 |
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CyberPingu posted:What the gently caress is wrong with you... Doesn’t like single-wing aircraft presumably
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# ? Jan 10, 2022 12:25 |
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Lady Disdain posted:Is there seriously no way to communicate with trains that there's something on the track up ahead ? Like the emergency stop button on an escalator. Trains have so much momentum that it is just not possible for them to stop quickly. Trains are equipped with emergency brakes, which cause them to stop as fast as they possibly can without derailing, but even that results in the train stopping a mile or more past the point at which the brake was pulled. EDIT: I mean, technically you can stop a train on a dime. It’s just that doing so causes the cars it is pulling to go flying off the track and kill people. The emergency brake makes the train brake as fast as it can without that happening. Ariong has a new favorite as of 12:47 on Jan 10, 2022 |
# ? Jan 10, 2022 12:41 |
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# ? May 27, 2024 23:30 |
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I know that they're slow to stop, but I think I've been underestimating just how slow.
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# ? Jan 10, 2022 13:18 |