Velocity/Acceleration
View attachment 200321 at t =2, isn't velocity constant (slope)? Then how can there be an acceleration?
View ArticleProjectile Motion (Concepts)
During projectile motion, does an object always fall to the ground with the same velocity and at the same angle as the initial velocity and angle? (assuming no air resistance) So at the initial and...
View ArticleEnzyme Kinetics Details
For the MCAT, what is the level of detail that we will have to understand for enzyme kinetics? It seems that in addition to the basic Michaelis Menten equation and constants of Km & Vmax, kcat has...
View ArticleElectricity
View attachment 200355 For this question, I got the right answer but I used a different method - I didn't take charge/electron into account. Q = It = nF n = (2x10^20)/(6.02x10^23) = 3 x 10^-4 So, I =...
View ArticleKidneys
When the pH is low, it would mean that there is a higher [H+] than normal. So kidneys would excrete greater amounts of H+. Do the kidneys also reabsorb greater amounts of HCO3-? Are these processes...
View ArticlePolyprotics
Are molecules like Ca(OH)2, Ba(OH)2 etc considered polyprotic bases? I know that the definition of polyprotic acid/base is something that can donate/accept multiple H+. But I am seeing mixed...
View ArticleAmino Acid Mutation Question
The question I encountered asks about which kind of mutation happened that would make cause a lack of 50 amino acids near the C terminus. The possible answers were missense mutation back mutation a...
View ArticleDistance, electric field and potential
Hey all, Conceptually I'm missing something about how distance is related to electric field and potential. Electric field is force per unit charge and potential is force per unit charge applied over a...
View ArticleDelta G spontaneous reaction
I don't understand this question. Can you explain the answer plzz If it's discovered that a certain nonspontaneous reaction becomes spontaneous if the temperature is lowered, then which of the...
View ArticlePendulum Tension
Q. A mass of 1 kg is tied to a 2-meter string and spun in circles at 60 rpm. What is the tension in the string? Assume π = 3. Answer The solution gave answer as 72N. F = ma, and a in this case is v2/r....
View ArticleKsp Question
I was hoping someone could help me make sense of this -- I'm following all of it until the explanation talks about cubing 5.5.. why is 5.5 cubed? What is the minimum number of moles of Be(OH)2(s) must...
View ArticleExamkrackers resting membrane potential question
On pg 47 of EK I am confused about questions 27 and 30. 27 says that if the membrane becomes impermeable to K+ but the Na+/K+ remains functional, then the resting potential becomes more positive due to...
View ArticleOsmotic vs oncotic pressure
Can anybody explain the difference between osmotic and oncotic pressures?
View ArticleVery confused about blood pressure, resistance and cardiac output :(
Please help me relate resistance, blood flow velocity, and cardiac output. Also, I have a question about why the answer is A. Wouldn't lowering the diameter cause an increase in pressure? This would...
View ArticleHemiacetal and Hemiketal formation
I was just wondering if the hemiacetal and hemiketal formations are Sn2 reactions. I feel unsure because an alcohol acts as a nucleophile and attacks the carbonyl of the ketone or aldehyde in what...
View Article(2r,3s)-2,3-dihydroxybutanedioic acid and (2s,3r)-2,3-dihydroxybutanedioic acid
Aren't these two molecules enantiomers of each other? The answer states that these two molecules are the same molecules (not enantiomers), but I can't figure out why that is... I would sincerely...
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Assigning R/S to Cylical Compounds
The image is from TPR's Demo Exam Q17. I do not understand how to go about figuring out which group are "towards" or "away" from you when in an cyclical ring like this. I get assigning priorities, but...
View ArticleLight absorption and reflection
Kaplan FL says that the riboflavin appears yellow to the human eye, thus it must be reflecting wavelengths corresponding to yellow light (570-590nm) and absorbing all other wavelengths. Can someone...
View ArticleWeber's Law
View attachment 200477 I am confused about this question. Can someone explain this? Here are my thoughts: I know Weber's equation is delta I = kI Looking at the change from 2 to 2/3 to 2/9, it seems...
View Articletorque definition
View attachment 200495 Using the equation rFsin(theta) is easy enough. But the previous definition (r cross F) confuses me. The cross product should result in a vector orthogonal to r and F. But in my...
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