Recent content by mathnoobie

Ah alright, thank you. That explains why my answer seemed to make no sense.

Homework Statement Hi, I am solving a system of differential equations and in one of my equations I have this, (D+2)X+(D+2)Y=0 where X and Y are variables, D is my differential operator. My question is, would it be mathematically correct to divide out (D+2) and thus getting X+Y=0, X=-Y ?

Homework Statement How much time does an RC circuit require to become fully charged assuming that the capacitor was initially uncharged. resistance = R capacitance = C Voltage = V Homework Equations Q=CV(1-e^(-t/RC)The Attempt at a Solution so T = -ln(Q/(CV) - 1)RC but Q = 0 since it's...

Sorry, I don't. I'm not fluent enough to understand his proof without further explanation. edit:AH, I think I finally understand the proof. This means that the integrating factor would be e^(∫(fx)dx) correct?

Ah, but my original question was whether this was a Bernoulli equation or a First Order Linear DFQ(if it is, why), b/c in the video, they stated n=1 as a First Order LinDFQ

I don't quite understand what you did, if n=1 y'(y^-1)+P(x)-q(x)=0

In a video I was watching regarding how to solve these, the lecturer said that the form of a Bernoulli Differential Equation is y'+P(x)y=q(x)y^n where n>1 This means that if n = 1, it wouldn't be a Bernoulli differential equation and would be a first order linear differential equation, but if...

Oh no, I was geometrically incorrect, I've been working with so many spheres that I assumed this was a sphere in the math even though I knew it was a disc. That fixes everything. Thank you!

C=9.3*10^-9 Farads. My answer is 3.7*10^-8, when I punch it in the calculator.

I confirmed with my professor about a week ago that it is to be solved using the flat plate approximation. He normally doesn't reply on the weekends though so I figured I'd go on here for help. I can't think of any other path to take regarding this problem.

Homework Statement The charge center of a thundercloud, drifting 3.0km above the Earth's surface, contains 20 C of negative charge. Assuming the charge center has a radius of 1.0km Calculate the Capacitance of the system. Homework Equations C=8.85*(10^(-12))*A/d Where A is the area, D...

Ah, I never thought of using Kirchoff's loop law for some reason, but after you made the connection for me I understand what you mean. Thanks for taking the time to help me :)

They aren't equal, I calculated them. V1=V5, and V3=V4, V2=V3+V4. My question was though, how can we say that they are in parallel(C2, C3, C4) if their voltages do not equal. I am probably not interpreting your statement correctly.

Wait, how is C2 in parallel with C3 and C4 when their voltages don't equal (V2=V3=V4)

Yes greatly, you explained how to find series/parallel connections much better than my book, all my book said was if the charge is equal they are in series, if the voltage is equal they are in parallel.