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How to use Dimensional Analysis?

I understand it's a method of converting units, but how do I use it?

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If you have miles per hr and you want ft per minute, you just keep multiplying by a form of ONE that will cancel out the words you don't want and give you words you do wAnt.
30mi/1hr x(1hr/60min)=30mi/60min.....
30mi/60min x (5280ft/1mi)=.
(30)(5280)ft / 60min..............................
(30)(5280)ft / 60min x (1min/60sec)=.
(30)(5280)ft/ (60)(60)sec.
Now simidy or divide and you have ft per sec!

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