Comments on: Understand Ratios with “Oomph” and “Often”

By: Tony

Tony — Sun, 05 Jun 2016 07:43:18 +0000

Thanks for this great article I really helped!!

Could you plz help understand why dividing by fraction we have to invert it how negative times negative is positive

Thank you

By: kalid

kalid — Fri, 05 Jun 2015 01:52:57 +0000

@Kumar: Glad you liked it, that’s a great application.

By: kumar

kumar — Thu, 04 Jun 2015 09:32:38 +0000

Hi Kalid,

As usual it is brilliant explanation. The way they should have taught in my school some very long time ago :). I also wanted to add that Water Power topic is another area where your Oomph X Often explanation fits perfectly.

Water Power = (Energy /Volume) * (Volume/Time) is more intuitive than the usual Water Power = Flow Rate * Head.

By: kalid

kalid — Sat, 25 Apr 2015 21:58:44 +0000

@Parallax: Thanks, I might not have been clear enough in this sentence:

“In the same minute, suppose Frank lifted 100lbs ten times, while Annie lifted 1000lbs once. From the equation, they have the same power (though to be honest, I’m more frightened by Annie.)”

So Frank took 60 seconds to lift 100×10 pounds, and Annie took 60 seconds to lift 1000×1 pounds. The net energy and time were the same, right? (I could clarify that Annie was pushing the entire minute to lift it up, not that she was done a few seconds in.)