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CAHSEE Math 1.2 Measurement and Geometry 191 Views


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Description:

CAHSEE Math Measurement and Geometry: Drill Set 1, Problem 2. Convert the value to meters per second.

Language:
English Language

Transcript

00:02

Here's an unshmoopy question you'll find on an exam somewhere in life...

00:08

Seventy-two kilometers per hour (km/h) is how many meters per second (m/s)?

00:12

Here are the potential answers...

00:17

This question is asking us to convert --

00:21

and to get the units right.

00:23

We have 72 KILOMETERS per HOUR which we want

00:27

to convert to METERS per SECOND.

00:30

Let's start by getting half way there and make it meters per hour.

00:34

Okay, so "KILO" means a thousand.

00:38

So 72 kilometers per hour is 72 thousand meters per hour.

00:43

Now to get hours converted into seconds.

00:46

Well, an hour has 60 minutes, which has 60 seconds...

00:49

so 60 times 60 gets you 3,600 seconds in an hour.

00:54

Go ahead and count 'em if you want to double-check. It's your hour.

00:58

The new equation then should be 72,000 over 3,600, and that's meters per second.

01:05

All we have to do now is reduce the number and we're there.

01:08

Cross out the 2 zeros here and here... and we have 720 over 36.

01:13

36 goes into 72 twice... and we have 20...

01:17

and our answer is B -- 20 meters per second.

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