# Recent content by Lavid2002

1. ### Calculating Exhaust Flow Rates

Hello everyone, I have been trying to calculate some exhaust flow rates for a while, and I am having some issues here. I was wondering if anyone could provide any insight. I am making a few assumptions for this calculation. I am assuming no fuel or air is lost through blow by gasses into the...
2. ### Scientific Workplace symbols not appearing properly

Hello everyone! My teacher for quantum requires us to write up our homeworks using scientific workplace. We access the software through our schools website and login. I have downloaded the program and I can use it on my computer through the internet. When I type in symbols hbar for...
3. ### Quick question about power lines and E=IxR

Ok so I have read that power lines carry very high voltage to minimize loss through resistance, but when I take a look at the formula E=IxR E=Voltage I=Current R=Resistance Divide both sides to get E/I=R To minimize R we should make the numerator of the quotient smaller, and the...
4. ### Coulomb's Law of a sphere

I see... I will go to my teacher during her office hours for help and stay on top of this stuff! A in physics this semester. :biggrin:
5. ### Coulomb's Law of a sphere

So just like subtraction means take away x numbers from the original number maximizing means find the derivative and set it equal to zero in these physics problems?
6. ### Coulomb's Law of a sphere

Qq-q2 When differentiated with respect to q is equal to Q-2q So Q-2q=0 +2q Q=2q /2 Q/2=q OHHHH So were saying if we multiply Q by .5 (1/2) this maximizes our equation. This is the part I needed Did you just know to do that? How do I know how to...
7. ### Coulomb's Law of a sphere

I'm sorry, I know how frustrating it can as a teacher when the student doesn't understand. Something very simple isn't clicking though. Is it safe to make the assumption that q is one half of Q so that makes q/Q 1/2? I dont think thats how these variables are being used. I solved...
8. ### Coulomb's Law of a sphere

q= A function of Q I worked out the q and got q = Square root of r2-Q But I looked in the book. the final answer is .5 or 1/2 I don't know how they got that numerical answer from these variables. hmmmm...
9. ### Coulomb's Law of a sphere

Cool that was easier than I thought : ) So now we have Q-q2/r2 ... But how do I know how to "Maximize" This equation? I know if I want to make this as big as possible I want my denominator to be as small as possible. So we make r=1? 12=1 And since I dont have values for Q I dont know what...
10. ### Window fog evaporation

Correct me if I'm wrong, but isn't condensation only possible if the object that air is condensing onto is colder than the air that the moisture is in? So it wouldn't be heat helping the glass wick away the moisture (Like a hot pan on the stove) Instead it would be cold temperatures, which...
11. ### Window fog evaporation

I am not 100%, but by thinking this out this is what I have come up with. Think about what caused the droplets to form on the glass. Your breath didn't only transfer moisture onto the glass, but heat too! The glass directly in the middle of the condensed area will be marginally warmer...
12. ### Coulomb's Law of a sphere

Basically I'm asking for a lesson on differentiation... I know with X I subtract one from the exponent and multiply by the old exponent x3 turns into 3x2 But I dont know what to do when I am differentiating other letters.... How in the world do I differentiate r2 with respect to q? If I knew...
13. ### Coulomb's Law of a sphere

Hello! I'm stuck in a rut. Right now I'm blowing through my calc 2 HW no problem. But this basic differentiation and solving for a variable is blowing my mind. I would love some help : /
14. ### Coulomb's Law of a sphere

Homework Statement Of the charge Q initially on a tiny sphere a portion q is transferred to a second nearby sphere. Both spheres can be treated as particles. For what value of q/Q will the electrostatic force between the two spheres be maximized? Homework Equations Coulomb's Law We...
15. ### Simple calculus integration help

I got it now : / This is what messes me up in this class. Not the calc II, the simple calc I and the algebra! Very frustrating. First homework assignment down. Thanks bud