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NBME 22 Answers

nbme22/Block 1/Question#9 (56.4 difficulty score)
A 54-year-old man has an aneurysm in the ...

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submitted by keycompany(308),
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oFlw Rtae = tioVlyec x aon-eCtloSrsics eraA

2 m2^c x 20 semc/c x 60 i/enmsc x 1 /001L,0 3mc^ = 4.2 mi/nL

000,1 c3^m = 1 L

seagull  Well, I missed this one. I don't even feel bad. +63  
link981  @keycompany a small typo, 100 cm^3 = 1 L not 1000cm^3. 1000 mL^3= 1 L +  
hello  @keycompany how did you edit your original comment to fix your typo? +  
winelover777  Pretty sure @keycompany was correct. 1 L = 1000 cm^3. Otherwise the answer would be 24. +3  
drdoom  1 centimeter is a distance. (A line.) +  
drdoom  If we multiply a line by another line, we get a surface area. (A piece of paper.) +  
drdoom  If we multiply the piece of paper by another line, we get volume. (A cube. A box.) +  
drdoom  If we fill the box with a fluid, we will have 1 mL of this fluid. +  
drdoom  If we have a thousand of these boxes, we have 1 L of fluid. +  
drdoom  1,ooo mL = 1 Liter = 1,ooo centimeter³ +  

if one still doesn't understand to add on .. 1000 cm^3 = 1000 ml 1000ml = 1 Litre

+4/- ribosome01(-3),

submitted by nwinkelmann(292),
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Iev' evren bnee odgo ta ventncirog ntsiu (: oll os ahd to aks my troh.reb eH ltod em t:hta

entscdai × iceatdns = edsianct2 = arae


edaitncs × itesncda × cteisnda = cedtnsai2 × iesdatcn = dtisaenc3 = lmuvoe

oGatt olev ipbluc lhocso rof evren bene uahttg ahtt ... esegh ouy(ilsobv 'eIv noed het ouieatnqs adn tu,ffs tsju rneve bnee ldot ti htat /wttahay mpeisl e.e)rfbo gnwKino thta emksa gfnugiir otu the taoiuqne mhuc rs:aeie

olFw rate = itlyoevc × CSA = 02 me/ccs × c2m2 = c4m03ec/s

oT rovctne to ,Limn/ sutj yplmt:lui

m40c3sc/e × 60 mi/scen × 1/cLm01,003 = 0420 10,L00/ imn = 42. n/imL

eoHp siht deh!pel

impostersyndromel1000  to all my public school peeps out there (and not the nice public schools in rich areas, the real public schools)... we made it! +3  
angelaq11  Thankfully I was taught how to convert units, but let me tell you that I was SO lost on this one. It's USELESS to know how to do it if you (I, I mean I) don't know the damn formula xD. Obviously got this one wrong, but it's good to know that if it ever comes up again (and I know it won't) I already know it. +1  

This is all you need for conversions:

1cm3 = 1 ml ... thus 40 cm3 = 40 ml

So to make it faster I would do it like this

40 ml/sec * 60 sec/1min * 1L/1000ml = 2.4 L/min

+/- majoav1(0),

submitted by seracen(13),
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gUh, oyrrs, entggti edus to the ,trtfgnmoia dan aiedclytalnc tdeosp it in teh gnrwo lacp.e

anyws,yA ot r,eriteeta I wylaas tusj olko at teh .itusn tI stwna Lim/n, 'Im vgeni 2^mc nad esc/mc

So I lup,lyimt ot teg mulveo tuo fo ti (3c^,)m enht ctonevr onesdsc to n.tsumie

suhT, its' ilacbsaly 2x,x26 ni oesm aepsh or morf eftar gnpailc eth edaiscml odGo hgtni htey 'tdidn dad ahtt caruitlarp wk,nierl lIl' aetk my adrmleie amht klsils dna bgu to,u .ahha..

submitted by kernicterusthefrog(112),
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stuJ ni csea ttha leylvo eittll eqtuaion edpvidor yb neky@ampyoc watns' uetqi onugeh orf y,ou e'hers a inlk ot a emro mteploce alniteoapxn yb nKah decmAy.a dlpeeH em, henw I eodklo at teh tuqaioen adn ,dsai ?aawhaa

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!

+3/- seracen(13),

submitted by usmleboy(10),

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

submitted by googaga(1),

Testing testing 123. This is a test post to see if things un scram ble by typing a comment. Thanks.

drdoom  i respect this attempt but i don't think it works that way +