if one still doesn't understand to add on .. 1000 cm^3 = 1000 ml 1000ml = 1 Litre
I've never been good at converting units :( lol so had to ask my brother. He told me that:
distance ร distance = distance2 = area
and,
distance ร distance ร distance = distance2 ร distance = distance3 = volume
Gotta love public school for never been taught that ... geesh (obviously I've done the equations and stuff, just never been told it that way/that simple before). Knowing that makes figuring out the equation much easier:
Flow rate = velocity ร CSA = 20 cm/sec ร 2cm2 = 40cm3/sec
To convert to L/min, just multiply:
40cm3/sec ร 60 sec/min ร 1L/1,000cm3 = 2400 L/1,000 min = 2.4 L/min
Hope this helped!
Ugh, sorry, getting used to the formatting, and accidentally posted it in the wrong place.
Anyways, to reiterate, I always just look at the units. It wants L/min, I'm given cm^2 and cm/sec
So I multiply, to get volume out of it (cm^3), then convert seconds to minutes.
Thus, it's basically 2x2x6, in some shape or form after placing the decimals appropriately. Good thing they didn't add that particular wrinkle, I'll take my remedial math skills and bug out, haha...
Testing testing 123. This is a test post to see if things un scram ble by typing a comment. Thanks.
This question was on my MCAT and I laughed when I saw it.
Things you gave to know: cm^3 = mL , then how to convert units.
2cm^2 x 20 cm/sec = 40cm^3 / sec = 40 mL / sec
From here just convert 40 mL / sec to L / min
40 mL / sec x 1 L / 1000 mL x 60 sec / 1 minute = 2.4 L / min
Just in case that lovely little equation provided by @keycompany wasn't quite enough for you, here's a link to a more complete explanation by Kahn Academy. Helped me, when I looked at the equation and said, whaaaa?
If, like me, you dislike memorizing formulas, but are okay doing the actual math, I always just look at the units. It wanted L/min, and I had to get it using cm^2 and cm/sec...
Well, I know cm^3 gives volume (L) after bashing out a few conversions, so multiply it is!
Then I know to turn seconds into minutes, so multiply by 60.
Now, at this point, I knew my decimals were off, but still, 4x6 = 24, so it's some version of that. Had they included 24 or .24 as answers, I'd have actually had to pay attention to my conversions.
Anyways, I hope that helps!
submitted by โkeycompany(351)
Flow Rate = Velocity x Cross-Sectional Area
2 cm^2 x 20 cm/sec x 60 sec/min x 1 L/1,000 cm^3 = 2.4 L/min
1,000 cm^3 = 1 L