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Study Question Q&A | Forum profile
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Forum profile page for Study Question Q&A on http://www.studentdoctor.net.
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Posting activity on Study Question Q&A:
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Top authors during last week:
user's latest post:
polyprotic titrations
Published (2009-12-20 21:00:00)
H2SO4 will react with 1 OH- to produce HSO4- and water. Then the HSO4- will react with with another OH- to produce SO4-2 and water. So both hydrogens come off H2SO4 to react with NaOH.
user's latest post:
rotational forces
Published (2009-12-24 08:17:00)
theres no force in the velocity direction?
user's latest post:
nucleophilicity and basicity
Published (2009-12-20 15:29:00)
Have you learned about thermodynamic/kinetic control? In any case, it does attack the carbonyl carbon, but the reaction is reversible, leaving us again with the OH- and the carbonyl. It is then free to attack the hydrogen on the alpha-carbon. This reaction is also reversible, but since it is the more stable product, this is the one that we get.
user's latest post:
Ovulation & Oogenesis
Published (2009-12-24 18:41:00)
the corpus luteum forms at ovulation. it's the leftovers from the follicle. edit: i can't comment on the particular steps.. seems correct to me, but i'm kind of fuzzy on the specifics. to be honest i don't think this amount of detail helps you on the mcat.
user's latest post:
rotational forces
Published (2009-12-22 23:57:00)
Quote: Originally Posted by rainashley i just want to know the different types of forces acting on the ball a ball is spun in a circle attached to a string over my head in a horizontal circular fashion what are the different forces acting on it? i know one is tension that is towards the center of the movement what else is there? what other forces? how many forces are acting on the ball total? thanks ...we already talked about the gravity...
user's latest post:
Coulomb's Law and Point...
Published (2009-12-18 18:02:00)
Exact wording: "if the point charges are halved and separation distance is increased to 2d, what is the new electrical force" if Force =10N Answer: 5/8. Answer explained: -Each charge is halved, F decreased by 4 therefore 1/4 As distance doubles, force reduces by 1/4 because F proportional to 1/r^2=1/4. So, they get F/16=10/16=5/8. I also got 1/16. Thanks for working it out and explaining. It makes sense. I was confused with...
user's latest post:
Trouble with Quantitative...
Published (2009-12-24 23:30:00)
Hi everyone, I've come to find that my weakest point in MCAT prep is general chemistry--more specifically, questions that have me calculate numerical values. I've been through BR twice and I feel like I know the theory very well but I'm missing the majority of calculation questions. I decided to take a break from BR because I feel like I'm wasting their great passages because I lack the fundamental skill of quantitative...
user's latest post:
Static friction question - Page...
Published (2009-12-17 18:54:00)
Quote: Originally Posted by Seraph 84 No, in physics, phi is used to represent an angle. Theta, and phi are the ones most commonly used. I usually use phi. Thanks, I never knew that. Blame it on my textbooks and professors.
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Latest active threads on Study Question Q&A::
Started 17 hours, 12 minutes ago (2009-12-26 00:13:00)
by PiBond
Quote:
Originally Posted by Sjs1234
I am reading EK Bio and this confused me.
In the text it says for the lock and key theory:
"In this theory, the active site of the enzyme has a specific shape like a lock that only fits a specific substrate, the key. The lock and key model explains some but not all enzymes"
For induced fit it...
Started 1 day, 6 hours ago (2009-12-25 10:46:00)
by Diggidy
It's fairly straight forward. The question is asking you to ponder the difference between small game and large game. It's also not a huge leap to assume that you would find tools used to kill and butcher an animal by the skeleton. Answer D is also a possibility, but I think it's too ambiguous and can mean too many things? Prepare the animals for use? Use in what?
Started 2 months, 3 weeks ago (2009-10-03 17:48:00)
by agp
Number of chromosome/DNA during Mitosis/Meiosis
SDN Members don't see this ad.
I always get confused about the number of chromosome and number of DNA (number, not sets) during different phases of mitosis and meiosis. I attempted to make a chart, please let me know if this is correct....
Started 1 day, 22 hours ago (2009-12-24 18:41:00)
by bleargh
the corpus luteum forms at ovulation. it's the leftovers from the follicle.
edit: i can't comment on the particular steps.. seems correct to me, but i'm kind of fuzzy on the specifics. to be honest i don't think this amount of detail helps you on the mcat.
Started 1 day, 6 hours ago (2009-12-25 11:08:00)
by Isoprop
resistivity is a constant for a substance that depends on what the material is made up of. It's an index number so we can compare two substances. What are we comparing? How much energy is lost when electrons are moved from one area to another or how much that substance opposes the flow of electrons. The higher the resistivity, the more "energy" is lost.
Resistance is a measure of how much ...
Started 1 day, 15 hours ago (2009-12-25 01:44:00)
by Kaushik
Personally, I think understanding the concepts is a better idea than just being able to plug-and-chug. You say that you're comfortable with all the theory, so you should be able to do the calculations just fine, especially since they don't require a calculator or anything like that. I only used the BR chem book as my resource and found it helpful, but the 1001 book also seems pretty good. It ...
Started 2 days, 9 hours ago (2009-12-24 07:33:00)
by Diggidy
Quote:
Originally Posted by 900824M
*A driver's skull(5kg) decelerates from 60km/h to 0 km/h in 0.75s during a road traffic accident. Calculate the impact force experienced by the skull.
This is asking for the impulse. You can do it multiple ways. You can find the force of the skull by finding the deacceleration then ...
Started 3 days, 22 hours ago (2009-12-22 18:57:00)
by bleargh
no font or resolution change on the real deal. they're about ~12 point font on a 1024 res
Started 4 days ago (2009-12-22 16:54:00)
by PiBond
Quote:
Originally Posted by rainashley
If you are spinning a ball around in a circle that's attached to a string over your head, what are the forces acting on the ball?
I know there is the force (tension) that your holding
what else is there?
thanks
gravity
Started 3 days, 20 hours ago (2009-12-22 20:39:00)
by PiBond
Quote:
Originally Posted by 97spooncivic
If you have a mass hanging on a string between two poles, pulls the rope slightly downward and creates a tension in the rope and an angle to the horizontal (theta). If you doubled the distance between these two poles, what would happen to theta (assume the same tension in the rope)?
This ...
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Hot threads for last week on Study Question Q&A::
Started 1 week ago (2009-12-19 13:17:00)
by rainashley
could someone please walk me through how to do this question? thanks
Started 4 days ago (2009-12-22 16:54:00)
by PiBond
Quote:
Originally Posted by rainashley
If you are spinning a ball around in a circle that's attached to a string over your head, what are the forces acting on the ball?
I know there is the force (tension) that your holding
what else is there?
thanks
gravity
Started 1 week, 2 days ago (2009-12-17 16:27:00)
by ishchayill
They are structurally the same, except that epinephrine has an N- methyl group that nor-epi does not. But they do have very similar functions.
Started 1 week, 4 days ago (2009-12-15 04:33:00)
by Isoprop
Not a physics expert, but here's my input:
As the laser passes through the hair, it will create a diffraction pattern. It turns out to be similar to the single slit experiment. Even if you didn't know that, the wavelength is almost always proportional distances between the maxima. I is correct.
Changing the gas may change the thin film problems, but the diffraction pattern is caused by ...
Started 6 days, 2 hours ago (2009-12-20 15:11:00)
by PiBond
Quote:
Originally Posted by happyfellow
I know this has been talked about in the past but I think it's an important concept, but an albeit confusing one.
I know that a nucleophile is a kinetic term while basicity is a thermodynamic one pertaining to proton transfer. I also know that there are strong bases that are nucleophiles ...
Started 3 weeks, 6 days ago (2009-11-29 16:17:00)
by ezsanche
on second thought
F(Friction) = mgsin( theta)
The only thing not included is the coefficient of static friction.
The coefficient of static friction only depends on the surface of the two objects that are in contact with each other.
Started 1 week, 1 day ago (2009-12-17 18:21:00)
by Isoprop
You were right that when the distance between the point charges decrease, the force should increase (inverse square proportionality). Also, decreasing the charges decreases the force (direct proportionality)
Let's plug in some numbers:
Orginally, let's plug in 1 for q's and d. F = kqq/d^2 = k(1)(1)/(1) = k
If we halve both charges and double the distance:
q's = 0.5 and d = 2.
F =...
Started 1 day, 6 hours ago (2009-12-25 10:46:00)
by Diggidy
It's fairly straight forward. The question is asking you to ponder the difference between small game and large game. It's also not a huge leap to assume that you would find tools used to kill and butcher an animal by the skeleton. Answer D is also a possibility, but I think it's too ambiguous and can mean too many things? Prepare the animals for use? Use in what?
Started 1 week, 1 day ago (2009-12-17 17:53:00)
by Isoprop
I used this little gem.
http://www.amazon.com/Primer-Genetic.../dp/0521603 65X
See if you can check it out fromt he library. Most of the book is beyond the scope of the MCAT but there are a few chapters worth reading with problems worth doing. I especially loved the pedigree chapters.
Started 2 days, 9 hours ago (2009-12-24 07:33:00)
by Diggidy
Quote:
Originally Posted by 900824M
*A driver's skull(5kg) decelerates from 60km/h to 0 km/h in 0.75s during a road traffic accident. Calculate the impact force experienced by the skull.
This is asking for the impulse. You can do it multiple ways. You can find the force of the skull by finding the deacceleration then ...
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