work with units, just as with numbers.
When doing conversions, just recall that you can always multiply by 1 and nothing is changed.
You want to convert meters into miles, and seconds into hours.
3600 seconds = 1 hour
So,
3600sec/hr = 1
Similarly, 1km = 1000m = 0.62 miles, so
.62mi/1000m = 1
Now, write your expression, and multiply by 1 to cancel the appropriate units:
130 m/s * 0.62mi/1000m * 3600s/hr
= (130 * 0.62 * 3600)/1000 mi/hr
= 290.16 mi/hr
Note how the seconds and meters just cancel out, just like variables in the usual algebraic expressions.
Sanity check:
60 mph = 88 ft/s, or about 30 m/s.
You have about 4.3 times that, or 258 mph, so the answer makes sense.
Okayy so my class is doing conversions annnd.I need help ALOT.
130 meters per second into miles per hour .
If you answer can you show me how you got the answer and how to know of the answer is right?
1 answer