Recent content by Sylvia

Why does ∆S = 0 for a reversible process, but for a reversible isothermal process, ∆S is given by nRln(Vf/Vi) (or other variations of that equation)?

Homework Statement Solve the initial value problem and determine at least approximately where the solution is valid (2x-y) + (2y-x)y' = 0 y(1) = 3 Homework EquationsThe Attempt at a Solution I know how to solve it, and I got the correct answer, which was: 7 = x^2 - yx + y^2 and then applying...

Thank you both very much, I understand it now!

Homework Statement You wish to obtain a magnification of -2 from a convex lens of focal length f. The only possible solution is to: A) place a virtual object at a distance 2f/3 from the lens. B) place a virtual object at a distance 5f/3 from the lens. C) place a real object at a distance...

Thank you, that makes so much sense. I thought the area had to be of the object radiating the light.

Homework Statement A 60 W bulb radiates light uniformly in all directions. What is the average intensity of the light bulb at a distance 0.40 m. Homework Equations I = P/A, part of my problem is that I don't know the relevant equations The Attempt at a Solution

Uhhhh sorry I'm in the non-calculus based class...

Im confused about where to proceed from there (my professor has done a horrible job of teaching this subject and the textbook isn't making much sense to me unfortunately)

So current = 3.5 V divided by Ztotal, and VPb = I * L * omega?

Homework Statement The circuit above has a 29 resistor and a 11.1 mH inductor. Calculate the theoretical phase difference between the current CPA and voltage VPB if the circuit is driven by a sinusoidal voltage source with a peak amplitude of 3.5 V at the following frequencies: 20 Hz 420 Hz...

Diethylamine was in excess (4 equivs to 1 equiv a-chloro-2,6-dimethylacetanilide), refluxed reaction for about an hour

In lab we had to synthesize lidocaine, and one of the steps involved reacting a-chloro-2,6-dimethylacetanilide with diethylamine to form lidocaine. My professor told us that diethylamine-HCl crystals would form and these would help us determine the lidocaine yield (since they form at a 1:1 mole...

SORRY for the confusion, I accidentally copied and pasted the wrong question. The actual problem is, If Q1 is negative and twice Q2, which is positive, where will the potential be zero?

But I thought voltage was a scalar?

Homework Statement If Q1 in the above figure is twice Q2 and both are positive, where can a point of zero potential be found?Homework Equations V = kq/r The Attempt at a Solution I know that eventually I'll have to set it up so that kq/r = kq/r, but my problem is, how do you know where this...