How Do You Convert Meters per Second to Miles per Hour in Dimensional Analysis?

AI Thread Summary
To convert meters per second to miles per hour, start with the speed in meters per second, which is 1255 m/s for helium at 25°C. The conversion involves using known factors: 1 mile equals 1609.34 meters and 1 hour equals 3600 seconds. The correct dimensional analysis would be to multiply 1255 m/s by the conversion factors to arrive at miles per hour. A suggested approach is to first convert seconds to hours and then meters to miles for accuracy. This method ensures a more precise conversion that is likely to satisfy academic standards.
castlegurl808
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1. Homework Statement [
Average speed of helium at 25C is 1255m/s. Convert this speed to mph


Homework Equations





The Attempt at a Solution


umm i tried to use this: 1255m/s (1mph/.477 m/s)
thats all i have and i don;t know if I did this correct
 
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Doesn't look bad, but I doubt your teacher will be pleased. Try longer route, based on well known conversion factors - seconds to hour, meters to mile.

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Thread 'Confusion regarding a chemical kinetics problem'

Thread 'Confusion regarding a chemical kinetics problem'

TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
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