Floating In Orbit (Slug Life Part II) - By MITK12Videos
Transcript
| 00:11 | so get this . I saw crazy advertisement on tv | |
| 00:15 | this morning . Weight loss , mumbo jumbo again , | |
| 00:18 | nope Hotel . What's so crazy about its orbiting around | |
| 00:22 | Earth ? Oh so it's a space hotel , yep | |
| 00:25 | . The ad said you could float around because there's | |
| 00:27 | no gravity out there . Well that's wrong . I | |
| 00:30 | know . Looks like we're going to have to go | |
| 00:32 | back into space and clear up some missing substance . | |
| 00:35 | I'll get my space suit . Hi , we're interested | |
| 00:39 | in a trip to your orbiting space hotel . Why | |
| 00:41 | certainly just step . Hey , I remember you guys | |
| 00:46 | . What did I do wrong this time you said | |
| 00:48 | that there's no gravity in Earth orbit ? Well there's | |
| 00:51 | not people are floating around up there . There is | |
| 00:55 | gravity . You just can't feel the effects of it | |
| 00:58 | . I'm going to get another science lesson . Aren't | |
| 01:00 | that ? You bet . I gotta say even though | |
| 01:04 | you don't know a lot about science , you had | |
| 01:06 | some really nice equipment right here . We're only about | |
| 01:10 | 370 km , 230 miles from Earth's surface Compared to | |
| 01:16 | the radius of the Earth , which is about 6400 | |
| 01:19 | km or 4000 miles . That's a really small distance | |
| 01:23 | . And as a result , the force of gravity | |
| 01:26 | is almost as much as it is on the surface | |
| 01:28 | of the Earth , it's only about 10% less . | |
| 01:30 | But why are we floating ? Gravity is pulling on | |
| 01:36 | us , but we don't feel its effects . Think | |
| 01:39 | about throwing a ball on Earth . I think we've | |
| 01:41 | got a human to help us demo this . Excellent | |
| 01:45 | . When you throw the ball , it travels in | |
| 01:47 | a parabolic arc and curves downward until it hits the | |
| 01:50 | ground . If you throw the ball harder , it | |
| 01:53 | travels farther but still curves in a parabolic art . | |
| 01:56 | Now let's zoom way out and scale things up . | |
| 01:58 | Say that we're on top of a really tall mountain | |
| 02:01 | and instead of throwing a ball , we're going to | |
| 02:04 | shoot it out of this cannon . Where did you | |
| 02:06 | guys get a giant cannon so quickly ? We know | |
| 02:09 | this guy . You know what ? That's not really | |
| 02:11 | important . We shoot the ball slowly and it curves | |
| 02:14 | towards Earth in one of those parabolic arcs . Exactly | |
| 02:18 | . We shoot the ball a little faster and it | |
| 02:20 | goes farther , but it still comes back to hit | |
| 02:23 | Earth even faster . The ball goes halfway around the | |
| 02:26 | world , but it still hits Earth . When we | |
| 02:30 | shoot the ball fast enough , it still curves towards | |
| 02:33 | Earth . But the curve of the parabolic arc is | |
| 02:36 | the same as the curve of Earth's surface . So | |
| 02:39 | the ball is falling towards Earth , but it's going | |
| 02:42 | so fast in the horizontal direction that it never hits | |
| 02:45 | the surface of Earth . Okay , so that's why | |
| 02:49 | my hotel stays in orbit and doesn't crash into Earth | |
| 02:52 | . My insurance company will be happy to hear that | |
| 02:54 | . Well actually there's a really tiny bit of Earth's | |
| 02:57 | atmosphere up here and that's enough to cause drag drag | |
| 03:01 | slows down your hotel and lowers the orbit . So | |
| 03:04 | in a few years your hotel will actually crash into | |
| 03:08 | Earth . But don't worry you can use rockets to | |
| 03:11 | boost it higher . Okay , we'll deal with that | |
| 03:14 | in a sec . But getting back to the topic | |
| 03:15 | at hand , you still haven't told me why we're | |
| 03:18 | floating . Right , good point . The hotel and | |
| 03:21 | us and everything else on board are all falling around | |
| 03:25 | the Earth at the same rate . It's like a | |
| 03:27 | really tall elevator , say you're at the top and | |
| 03:30 | the rope is cut , The elevator starts falling with | |
| 03:32 | us in it . Since we're falling at the same | |
| 03:34 | rate as the elevator , we can float around nifty | |
| 03:38 | . It's just like you're orbiting hotel except the elevator | |
| 03:41 | eventually crashed . Looks like you guys should stick to | |
| 03:45 | floating in space . Huh . Ouch . So I | |
| 03:49 | shouldn't be advertising that there's no gravity in my orbiting | |
| 03:52 | space hotel , nope . That's wrong . But I | |
| 03:56 | can say that people will feel weightless and float around | |
| 03:59 | free from the effects of gravity . Sure . And | |
| 04:02 | they won't crash into the Earth either . Not as | |
| 04:04 | long as you rig up those booster rockets . Well | |
| 04:06 | , this has been great . I've learned some stuff | |
| 04:09 | . You haven't put this company out of business , | |
| 04:10 | like the last one , so thanks . You're welcome | |
| 04:13 | . We're happy to teach you in exchange for free | |
| 04:15 | trips to space . Wait , who said this was | |
| 04:17 | free ? Mhm . Yeah . |
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