A trip through space to calculate distance - Heather Tunnell
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0:06 - 0:08Do you have a friend or a sibling
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0:08 - 0:09that's always competing with you
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0:09 - 0:11to see who's the fastest?
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0:11 - 0:13Our alien friends, Bleebop and Mark
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0:13 -are having the same debate
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Not Syncedwith their custom-built rockets,
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Not Syncedand they've asked us
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Not Syncedto be the judge of a space race to their moon.
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Not SyncedThe only problem is that they are starting
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Not Syncedfrom different asteroids.
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Not SyncedBleebop is on an asteroid 240 miles from the moon,
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Not Syncedand Mark is on one 150 miles away.
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Not SyncedDon't worry, it's not rocket science.
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Not SyncedSolving this equation is as simple as DIRT.
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Not SyncedWe can decide who the winner is
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Not Syncedusing the D=RT formula, or DIRT.
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Not SyncedThis stands for distance equals rate times time.
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Not SyncedIn the case of Bleebop and Mark,
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Not Syncedwe will only know the distance they traveled
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Not Syncedand the time it took for them
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Not Syncedto get to the finish line.
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Not SyncedIt'll be up to us to find the rate
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Not Syncedand who is faster.
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Not SyncedLet's turn to the race now
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Not Syncedand see what information we get.
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Not SyncedThree,
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Not Syncedtwo,
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Not Syncedone,
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Not Syncedblast off!
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Not SyncedBleebop and Mark's rockets go zipping
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Not Syncedacross the galaxy towards their moon,
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Not Synceddodging clunky meteorites
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Not Syncedand loopy space bugs.
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Not SyncedAfter a few close calls with a wondering satellite,
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Not SyncedMark arrives first in two hours
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Not Syncedand Bleebop gets there one hour later.
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Not SyncedLooks like Mark has the faster rocket,
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Not Syncedbut let's check out the results with our DIRT equation.
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Not SyncedBegin by setting up a chart.
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Not SyncedMake four columns and three rows.
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Not SyncedUse D=RT to remember what to fill in.
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Not SyncedEach rocket will have information
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Not Syncedfor distance, rate, and time.
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Not SyncedMark's rocket went 150 miles,
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Not Syncedwe don't know the rate,
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Not Syncedand he got there in 2 hours.
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Not SyncedBleebop's rocket went 240 miles,
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Not Syncedwe don't know the rate,
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Not Syncedand the time was 1 hour after Mark
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Not Syncedor 3 hours.
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Not SyncedBecause we don't know Mark or Bleebop's rate,
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Not Syncedthat number is going to be a variable
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Not Syncedin each equation,
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Not Syncedwhich we'll represent with x.
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Not SyncedWe'll solve the equation
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Not Syncedfor the variable to find its value.
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Not SyncedMark finished first,
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Not Syncedso start with his rocket.
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Not SyncedRemembering DIRT, write down D=RT.
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Not Synced150 miles equals x times 2 hours.
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Not SyncedDivide both sides by 2 hours.
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Not SyncedThis will leave x isolated
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Not Syncedon the right side of the equation.
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Not Synced150 miles divided by 2 hours is 75 miles over 1 hour.
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Not SyncedMark's rate is 75 miles per hour.
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Not SyncedThat's what mph means.
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Not SyncedIt's the amount of miles over one hour.
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Not SyncedStill think Mark is faster?
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Not SyncedLet's set up the same equation for Bleebop and see.
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Not SyncedD=RT
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Not Synced240 miles equals x times 3 hours.
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Not SyncedDivide both sides by 3 hours.
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Not SyncedThis will leave x isolated
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Not Syncedon the right side of the equation.
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Not Synced240 miles divided by 3 hours is 80 miles over 1 hour.
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Not SyncedBleebop's rate is 80 miles per hour.
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Not SyncedWow, even though Bleebop got there one hour later,
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Not Syncedit turns out he had the faster rocket.
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Not SyncedMark seems pretty upset,
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Not Syncedbut with aliens, you can never really tell.
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Not SyncedThanks to DIRT, you now know how to calculate
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Not Synceddistance,
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Not Syncedrate,
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Not Syncedand time.
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Not SyncedIn what other situations
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Not Syncedcan you use the distance formula?
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Not SyncedYou don't even need to be watching a space race.
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Not SyncedAs long as you know two pieces of information
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Not Syncedfor the formula D=RT,
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Not Syncedyou can calculate any moving vehicle or object.
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Not SyncedNow, the next time you're in a car,
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Not Syncedyou can let your friends know
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Not Syncedexactly when you'll be arriving,
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Not Syncedhow fast you're going,
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Not Syncedor the distance you'll travel.
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Not SyncedIt's as simple as DIRT.
- Title:
- A trip through space to calculate distance - Heather Tunnell
- Description:
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View full lesson: http://ed.ted.com/lessons/a-trip-through-space-to-calculate-distance-heather-tunnell
Imagine two aliens racing across outer space to their moon. Who can we deem the fastest alien? With DIRT -- or the equation Distance = Rate x Time -- we can calculate their rates, using the distance they traveled and the time they took. Heather Tunnell explains how to use this helpful equation to determine which of our alien friends is truly faster.
Lesson by Heather Tunnell, animation by Karrot Animation.
- Video Language:
- English
- Team:
- closed TED
- Project:
- TED-Ed
- Duration:
- 03:47
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Andrea McDonough edited English subtitles for A trip through space to calculate distance - Heather Tunnell | ||
Andrea McDonough edited English subtitles for A trip through space to calculate distance - Heather Tunnell |