A trip through space to calculate distance - Heather Tunnell

一次在太空计算距离的旅程- Heather Tunnell

翻译人员: Cissy Yun 校对人员: Jenny Yang

Do you have a friend or a sibling

你是否有一个朋友或者姐妹

that's always competing with you

总是跟你竞争

to see who's the fastest?

看谁最快吗？

Our alien friends Bleebop and Mark

我们的外星朋友Bleebop和Mark

are having the same debate

正在进行同样的辩论

with their custom-built rockets,

是关于他们定制的火箭

and they've asked us

并且他们要我们

to be the judge of a space race to their moon.

来当这场“去月球太空速度竞赛”的裁判

The only problem is that they are starting

唯一的问题是，他们是从

from different asteroids.

不同的小行星开始的

Bleebop is on an asteroid 240 miles from the moon,

Bleebop在一个离月球240英里行星上，

and Mark is on one 150 miles away.

而Mark是一个150英里以外的行星上。

Don't worry, it's not rocket science.

不用担心，这不是火箭科学。

Solving this equation is as simple as DIRT.

解出这个等式就和DIRT一样简单。

We can decide who the winner is

我们可以决定谁是赢家

using the D=RT formula, or DIRT.

通过使用D＝RT的公式，名为“DIRT”.

This stands for distance equals rate times time.

这个公式代表“距离=速率x时间”

In the case of Bleebop and Mark,

Bleebop和Mark的这件事中

we will only know the distance they traveled

我们只需知道他们所经过的距离

and the time it took for them

和他们用来到达

to get to the finish line.

终点的时间

It'll be up to us to find the rate

便可得出它们的速度

and who is faster.

和谁是更快的那一方

Let's turn to the race now

让我们现在来关注这一竞赛

and see what information we get.

并且来看看我们所能得到的信息

Three,

三

two,

二

one,

一

blast off!

发射升空！

Bleebop and Mark's rockets go zipping

Bleebop和Mark的火箭们飞快地

across the galaxy towards their moon,

穿过银河，并到达了向他们的月球飞去

dodging clunky meteorites

他们躲闪了沉重的陨星

and loopy space buggies.

和呆头呆脑的太空老爷车

After a few close calls with a wandering satellite,

在差点与一些漫游卫星碰撞而死里逃生后

Mark arrives first in two hours,

Mark在两小时内先到达，

and Bleebop gets there one hour later.

Bleebop在他的一小时后到达了

Looks like Mark has the faster rocket,

看上去好像Mark有一个更快的火箭

but let's check out the results with our DIRT equation.

但是让我们再用DIRT等式检查一下结果

Begin by setting up a chart.

首先，定制一张表

Make four columns and three rows.

做成四列三排的样子

Use DIRT to remember what to fill in.

用DIRT公式来记录填进去的内容

Each rocket will have information

每个火箭都会有关于

for distance, rate, and time.

距离，速率和时间的信息。

Mark's rocket went 150 miles,

Mark的火箭走了150英里，

we don't know the rate,

我们不知道速率，

and he got there in 2 hours.

并且他花了2个小时。

Bleebop's rocket went 240 miles,

Bleebop的火箭走了240英里，

we don't know the rate,

我们不知道速率，

and the time is 1 hour after Mark,

并且他到达时，比Mark晚了一小时

or 3 hours.

也就是总共3个小时

Because we don't know Mark or Bleebop's rate,

因为我们不知道Mark或者Bleebop的速率，

that number is going to be a variable

这个数字将会成为每个方程式里

in each equation,

的变量

which we'll represent with x.

我们可以用X表示。

We'll solve the equation

我们会解方程

for the variable to find its value.

并给找出这些变量的值

Mark finished first,

Mark先到达，

so start with his rocket.

所以从他的火箭开始。

Remembering DIRT, write down D=RT.

记住DIRT公式，写下D＝RT。

150 miles equals x times 2 hours.

150=2X

Divide both sides by 2 hours.

两边同除2

This will leave x isolated

使X成为在

on the right side of the equation.

等号右边唯一的量。

150 miles divided by 2 hours

150英里除以2个小时

is 75 miles over 1 hour.

是75英里每小时

Mark's rate is 75 miles per hour.

Mark的速率是75英里每小时

That's what mph means.

那就是mph的意思

It's the amount of miles over one hour.

它是在一个小时内的英里总数

Still think Mark is faster?

你还认为Mark更快吗？

Let's set up the same equation for Bleebop and see.

让我们来给Bleebop设定同一个方程式，再来看

D=RT

D=RT

240 miles equals x times 3 hours.

240=3X

Divide both sides by 3 hours.

两边同时除以3个小时。

This will leave x isolated

使X成为在

on the right side of the equation.

方程的右边唯一的量。

240 miles divided by 3 hours

240英里除以3个小时

is 80 miles over 1 hour.

是80英里一个小时。

Bleebop's rate is 80 miles per hour.

Bleebop的速率是80英里每个小时。

Wow, even though Bleebop got there one hour later,

哇，尽管Bleebop晚了一个小时到达

it turns out he had the faster rocket.

但其实他有着更快的火箭。

Mark seems pretty upset,

Mark看上去很沮丧，

but with aliens, you can never really tell.

但关于外星人的一些事，我们谁也说不准

Thanks to DIRT, you now know how to calculate

多亏了DIRT公式，你现在知道怎么去计算

distance,

距离

rate,

and time.

速率

还有时间

In what other situations

还有在什么情况下

can you use the distance formula?

你也可以使用距离公式呢？

You don't even need to be watching a space race.

你甚至不用去看太空竞赛

As long as you know two pieces of information

只要你知道公式D＝RT中的

for the formula D=RT,

两部分信息，

you can calculate any moving vehicle or object.

你就能计算出任何关于车辆或者物体移动的信息

Now, the next time you're in a car,

下一次你在一辆轿车上时，

you can let your friends know

你便能让你的朋友知道

exactly when you'll be arriving,

你将会到达的准确时间

how fast you're going,

你的速度

or the distance you'll travel.

或者你需要经过的路程距离了

It's as simple as DIRT.

这和DIRT一样简单