CAHSEE Math Measurement and Geometry: Drill Set 1, Problem 2. Convert the value to meters per second.
|CAHSEE Math||Measurement and Geometry|
|Coordinates and Graphs||Appropriate Units and Scales|
|Mathematics and Statistics Assessment||Modeling and Applications|
|Measurement and Geometry||Rates and units|
We have 72 KILOMETERS per HOUR which we want
to convert to METERS per SECOND.
Let's start by getting half way there and make it meters per hour.
Okay, so "KILO" means a thousand.
So 72 kilometers per hour is 72 thousand meters per hour.
Now to get hours converted into seconds.
Well, an hour has 60 minutes, which has 60 seconds...
so 60 times 60 gets you 3,600 seconds in an hour.
Go ahead and count 'em if you want to double-check. It's your hour.
The new equation then should be 72,000 over 3,600, and that's meters per second.
All we have to do now is reduce the number and we're there.
Cross out the 2 zeros here and here... and we have 720 over 36.
36 goes into 72 twice... and we have 20...
and our answer is B -- 20 meters per second.