What If Everyone JUMPED At Once?
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0:01 - 0:07Hey, Vsauce, Michael here, and what if every
single person on Earth jumped at the exact -
0:07 - 0:12same time? Could it cause an earthquake, or
would we not even be able to tell? -
0:12 - 0:17Well, first things first, let's talk about
the Earth's rotation. -
0:17 - 0:22The Earth spins, that's why we have night
and day, and it spins quickly. At the equator, -
0:22 - 0:25the Earth is spinning at more than 1,000 MPH.
-
0:25 - 0:32Now, a spinning ice skater can speed up by
moving mass closer to the center, and the -
0:32 - 0:37Earth is no different; In fact, if you get
down on the ground right now and move your -
0:37 - 0:43mass closer to Earth's center, technically,
you will speed up Earth's rotation, making -
0:43 - 0:45this day shorter.
-
0:45 - 0:50Now, the change that you would make to the
Earth's rotation is way smaller than we could -
0:50 - 0:55even measure, but it is calculable, and the
impact can be quite impressive when you talk -
0:55 - 0:59about redistributing more mass than just one
person. -
0:59 - 1:04For instance, last year, the earthquake in
Japan redistributed so much of Earth's mass -
1:04 - 1:11towards the center, that every day since then
has been 1.8 microseconds shorter. -
1:12 - 1:19But, that was a giant geological event. What
can us humans do to the Earth all on our own? -
1:20 - 1:25I mean, there are more than 7 billion of us
now- what if we all got together in one place -
1:25 - 1:26and jumped?
-
1:26 - 1:28Well, what would that even look like?
-
1:28 - 1:33Interestingly, if you took the entire human
population of Earth and had them all live -
1:33 - 1:40in one place with the same density that people
live in in New York City, you could fit everyone- -
1:40 - 1:43all of us- into the state of Texas.
-
1:43 - 1:47But that's living, not standing around in
a crowd, which is how we would probably want -
1:47 - 1:48to do the jump.
-
1:48 - 1:52If every single person alive right now on
Earth stood shoulder to shoulder, you could -
1:52 - 1:58fit all of us into the city of Los Angeles.
It would be an incredible sight to behold- -
1:58 - 2:03a mere 500 square miles containing every single
person on Earth. -
2:03 - 2:09Ok, so, then we jump. What happens?
-
2:09 - 2:15Unfortunately, not much. I mean, we're all
awesome people here on Earth, but our collective -
2:15 - 2:18mass compared to the mass of the entire Earth?
It's like, nothing. -
2:18 - 2:23In fact, Dot Physics calculated that if all
of us were to get together in one location -
2:23 - 2:29and all jump 30 cm into the air at the exact
same time, we would push Earth away from us -
2:29 - 2:31a tiny amount.
-
2:31 - 2:38Earth would only move away from us about 1/100th
of the width of a single Hydrogen Atom. And -
2:38 - 2:43here's another thing: because we're all jumping
and the going back to where we started, Earth -
2:43 - 2:46is just going to move back to where it started.
-
2:46 - 2:52So, our big jump won't be able to change Earth's
position in space, but, c'mon, 7 billion people -
2:52 - 2:57all jumping together? That's gotta be able
to cause some sort of seismic activity, right? -
2:57 - 3:01So, let's say you have a lot of people all
together in one place, and you have them all -
3:01 - 3:02jump on: 1-2-3!
-
3:02 - 3:09Did you feel that? Well, the BBC did this
with 50,000 people, and discovered that a -
3:09 - 3:15kilometer and a half away, it only registered
a .6 on the Richter scale. You would need -
3:15 - 3:217 million times more people than even live
on Earth right now to jump at once to recreate -
3:21 - 3:23the earthquake that recently happened in Japan.
-
3:23 - 3:28So, even though we're all awesome, compared
to the size of the Earth, we're not much. -
3:28 - 3:33But don't get too discouraged. Our collective
jump would contain a lot of energy. The Straight -
3:33 - 3:38Dope calculated that even if only the people
who lived in China got together and jumped, -
3:38 - 3:45their jump would be the equivalent of 500
tons of TNT. Of course, 500 tons of TNT doesn't -
3:45 - 3:52do much to an Earth that weighs 6 sextillion,
588 quintillion tons. -
3:53 - 3:58To make yourself feel more powerful, pick
a card. I've got 10 of them here, let's say, -
3:58 - 4:05hmmm, you choose this one. Boom, congratulations,
we have just decimated this deck of cards. -
4:06 - 4:13Why? Well because, technically, decimate does
not mean "obliterate completely." -
4:13 - 4:20Deci=10. It means to take away 1/10th of something.
So, the next time you take a quiz and don't -
4:20 - 4:27do so well on it- you only get 10%, well sure
that's an "F", but, by getting 10% of them -
4:27 - 4:30right, you DECIMATED that quiz.
-
4:30 - 4:36And since we've been talking about crowds,
let's talk about YouTube crowds. YouTube audiences, -
4:36 - 4:40that view count that you see at the bottom
of every video, and get some perspective on -
4:40 - 4:40it.
-
4:40 - 4:43We'll being with Dunbar's Number.
-
4:43 - 4:49It's an estimation of the maximum number of
people we can have stable, social relationships -
4:49 - 4:53with at a given moment, and it's based on
the size of our neo-cortex. -
4:53 - 4:58These aren't just acquaintances, these are
people you have social contact with; a network -
4:58 - 5:02where you know how everyone relates to everyone
else. And the number is usually given to be -
5:02 - 5:09somewhere between 100-230, which means that when
a YouTube video receives more than 230 views -
5:11 - 5:16from different people, more people have seen
that video than you could ever realistically -
5:16 - 5:19hope to know well, at a given moment.
-
5:19 - 5:24If a video has more than 100,000 views from
different people, more people have seen that -
5:24 - 5:31video than you will ever meet in your life.
And by meet, I mean shakes hands with, learn -
5:32 - 5:33their name, talk with them for a bit.
-
5:33 - 5:39I mean, think of it this way: you and me,
we're only statistically expected to live -
5:39 - 5:46around 28,470 days. So, even if you were to meet
someone, 2-3 people every day of your life -
5:47 - 5:51(including when you were a baby), you still
wouldn't meet as many people as have seen -
5:51 - 5:54that YouTube video with 100,000 views.
-
5:54 - 6:00But, keep this in mind: even though you, or
even a large group of us, can't do much to -
6:00 - 6:06change Earth's location or rotation, we can
affect it a little bit. Newton's Third Law -
6:06 - 6:12guarantees this. If you weigh 150 pounds,
the Earth is pulling you down with a force -
6:12 - 6:19of 150 pounds. But, you are also pulling up
on the Earth with a force of 150 pounds. -
6:19 - 6:25If you fall 3 meters, the Earth has pulled
you down 3 meters. But, you have also exerted -
6:25 - 6:30an equal and opposite force on the Earth.
Of course, it's a lot bigger. So, if you fall -
6:30 - 6:353 meters, you pull the Earth up about one-billionth
of the width of a Proton...which ain't bad? -
6:35 - 6:41So, the next time you move your body-the next
time you jump, Felicia- think about this: -
6:41 - 6:47you just affected the Earth as much as it
affected you. You've got that kind of power. -
6:47 - 6:50Speaking of power, you all should go check
out "Geek & Sundry", Felicia's new channel. -
6:50 - 6:56It's one of my new favorite things...And,
as always, thanks for watching.
- Title:
- What If Everyone JUMPED At Once?
- Description:
-
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For helping me with this video at Summer in the City!!
theINENIvlogs behind the scenes Summer in the City vid with me: http://www.youtube.com/watch?v=F_Rd35906MQWhy videos views freeze in the 300s on YouTube (sub to this channel FTW, seriously): http://www.youtube.com/watch?v=oIkhgagvrjI
Japan Earthquake and Earth's rotation: http://en.wikipedia.org/wiki/2011_T%C5%8Dhoku_earthquake_and_tsunami#Geophysical_effects
All people in one place LIVING: http://persquaremile.com/2011/01/18/if-the-worlds-population-lived-in-one-city/
shoulder-to-shoulder: http://news.nationalgeographic.com/news/2011/10/111031-population-7-billion-earth-world-un-seven/
BBC Jump Video: http://www.bbc.co.uk/learningzone/clips/if-the-whole-world-jumped-at-the-same-time-would-the-planet-move/13428.html
SCALE OF UNIVERSE AWESOME: http://htwins.net/scale2/
STRAIGHTDOPE article on a jump: http://www.straightdope.com/columns/read/142/if-all-chinese-jumped-at-once-would-cataclysm-result
Dot Physics on the jump: http://www.wired.com/wiredscience/2010/08/what-if-everyone-jumped/
Interactive scale of the universe: http://scaleofuniverse.com/
Decimate: http://www.etymonline.com/index.php?allowed_in_frame=0&search=decimate&searchmode=none
Dunbar's Number: http://en.wikipedia.org/wiki/Dunbar's_number
NPR story on Dunbar's number: http://www.npr.org/2011/06/04/136723316/dont-believe-facebook-you-only-have-150-friends
Life Expectency: http://en.wikipedia.org/wiki/Life_expectancy
How many people you meet in your life: http://eclectic24.wordpress.com/2009/03/15/how-many-people-will-you-meet-in-your-lifetime/
Newton's Third Law: http://www.physicsclassroom.com/class/newtlaws/u2l4a.cfm
- Video Language:
- English
- Duration:
- 07:13
Divulgame edited English, British subtitles for What If Everyone JUMPED At Once? | ||
Divulgame edited English, British subtitles for What If Everyone JUMPED At Once? |