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CAHSEE Math Videos 210 videos
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Description:
CAHSEE Math Measurement and Geometry: Drill Set 1, Problem 2. Convert the value to meters per second.
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.
Full Transcript
- 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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