xkcd 'what if

It's actually a pentagon. The Moon orbits around the Earth at a speed of roughly one kilometer per second, making a wide circle[10]Yes, I know, orbits are conic sections which in the case of the Moon is technically not exactly a circle. More details. from $19.00 Compiling. Randall Munroe is the author of the #1 New York Times bestseller What If?, the science question-and-answer blog What If, and the popular webcomic xkcd.A former NASA roboticist, he left the agency in 2006 to draw comics on the Internet full-time, supporting himself through the sale of xkcd t-shirts, prints, posters, and books.He likes candlelight dinners and long walks on the beach. Sadly, no one's figured out a practical way to build a "reverse heat shield" rocket. 139k. XKCD College-Style Shirt. What If? I'm not even sure how I feel Sunday, September 14 More details. The Moon doesn't always stay the same distance from Earth. When you're hanging onto the pole, there are three forces pulling on you: The Earth's gravity pulling you toward Earth, the Moon's gravity pulling you away from Earth, and centrifugal force[6]As usual, anyone arguing about "centrifugal" versus "centripetal" force will be put in a centrifuge. There's one other cycle we can take into account to really nail down the Moon's ground speed. Instead, you should probably wait until you're somewhere near airline cruising altitude, where the air is still thin, so it's not pulling at you too hard—and let go of the pole. How long would it take to slide down from the Moon? If you’re willing to spend $1,700, you could actually buy a ready-made set of the elements online. XKCD's Randall Munroe is publishing a book of science explainers! Top posts february 10th 2016 Top posts of february, 2016 Top posts 2016. every 29 days or so. What if we had a magical pole that dangled from the Moon down to just above the Earth's surface, expanding and contracting so it never quite touched the ground? That's how fast the top end of our hypothetical fire pole will be traveling. This means you're free to copy and share these comics (but not to sell them). People often ask why we don't use rockets to slow down, to avoid the need for a heat shield. xkcd, sometimes styled XKCD, is a webcomic created in 2005 by American author Randall Munroe. Thanks to heat shields, slowing down is, Yes, I know, orbits are conic sections which in the case of the Moon is. from $19.00 Correlation. Even though the end of the pole is moving slowly relative to the Earth as a whole, it's moving very fast relative to the surface. You're about to drop into some extremely strong winds. Even if an object is moving slowly when it's drifting through space, when it gets close to the Earth it gets accelerated up to at least escape velocity by that final segment of the trip down into the Earth's gravity well. $19.00 Linux Cheat Shirt. A former NASA roboticist, he left the agency in 2006 to draw comics on the Internet full-time, supporting himself through the sale of xkcd t-shirts, prints, posters, and books. Millions of people visit xkcd.com each week to read Randall Munroe’s iconic webcomic. You may occasionally see people get excited about the ", As usual, anyone arguing about "centrifugal" versus "centripetal" force will. A serious scientific answer to an absurd hypothetical, and the first chapter of Randall Munroe's upcoming book. Reddit gives you the best of the internet in one place. And now you know.​[13]Mt. There's this recurring theme in xkcd of the possibility and choice to pursue the unknown, with other such comics including 59, 137, 267, and 706. The bottom end of the pole makes a much smaller circle in the same amount of time, moving at an average speed of only about 35 mph relative to the center of the Moon's orbit: 35 miles per hour doesn't sound bad. A somewhat more obscure piece of trivia is that the point on the Earth's surface farthest from its center is the summit of Mt. In my opinion, it's worth going outside and looking at the Moon whenever it's full, regardless of whether it's super or not. When the Moon's tilt is in the same direction as the Earth's, it stays 5° closer to the Equator than the Sun, and when it's in the opposite direction, it reaches more extreme latitudes. }}, xkcd.com is best viewed with Netscape Navigator 4.0 or below on a Pentium 3±1 emulated in Javascript on an Apple IIGS, Creative Commons Attribution-NonCommercial 2.5 License. If you don't stop yourself, you'll reach the top of the atmosphere at roughly escape velocity—11 km/s[8]This is why anything that falls into the Earth hits the atmosphere fast enough to burn up. Thanks to heat shields, slowing down is much easier than speeding up—which requires the aforementioned giant fuel tank. Its orbital speed also changes depending on whether it's at the close or far point in its orbit. Munroe states on the comic's website that the name of the comic is not an initialism, but "just a At first, the combination of the Moon's gravity and centrifugal force are stronger, pulling you toward the Moon, but as you get closer to the Earth, Earth's gravity takes over. Regardless of where you come down, you'll need to contend with supersonic winds, so you should wear lots of protective gear. > >| Hopefully in a couple of weeks we'll be able to resume our apple-focused updates, because we have SO MUCH to say about Cosmic Crisp. 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