Recent content by Number1Ballar

Okay I think I'm finally starting to get this, thanks so much for your help!

Okay well I will try this again. Starting at point a, current going to the left, I got 10V - 2I1 + I2 - 20V + 4I2 - 3I1 = 0. Simplifying to: -10V - 5I1 + 5I2 = 0 Then, starting from point b, current going to the left and assuming current in bottom branch is (I1 + I2) is: 20V - I2 + 10(I1...

Hmm I don't know which sign is wrong. Here is the picture again, but I drew in positive and negative terminals on the resistors. I think my problem is understanding when to add and when to subtract. Is my image right? or am I completely off? It must be wrong, because in following this...

hmmm I still seem to be getting the wrong answer. The direction of current would be flowing to the right in the bottom branch. In re-doing my calculations I got: 10V - 2(I1) + I2 - 20V + 4I2 - 3I1 = 0 20V - I2 + 10(I1 + I2) - 4I2 = 0 20V + 10I1 +52 = 0 -2 - 0.5I2 = I1 Plugging...

well, that's my problem. I don't know how to find the current in any of the branches, and when I did try to find them, my answers were way off.

Homework Statement The 5.00-V battery in the figure ( http://session.masteringphysics.com/problemAsset/1009413/11/yf_Figure_26_42.jpg ) is removed from the circuit and replaced by a 20.00-V battery, with its negative terminal next to point b. The rest of the circuit is as shown in the figure...

Homework Statement Consider the example of a positive charge q moving in the xy plane with velocity \hat{v} = vcos(\theta)\hat{x} + vsin(\theta)\hat{y} (i.e., with magnitude v at angle \theta with respect to the x-axis). If the local magnetic field is in the +z direction, what is the...

actually I think I figured it out.. C = (3.7)(8.85 X 10-12 F/m)(0.0125m2) / (0.0003m) = 1.36 X 10-9F = 1.36 nF

hmmm okay I'm starting to see how a capacitor works, but am still a little confused on how to do this problem. I see that if the paper was in between these 2 sheets, then 'd' would equal 0.0003m, 'A' would equal 0.0125m2, and for \epsilon I would plug in the value of k given? so.. C =...

Homework Statement Suppose you constructed a capacitor using two 5cm*25cm sheets of foil and a 0.3mm thick piece of paper (k=3.7). What is its capacitance? Calculate to 1 decimal place. Use units of "nF". (1nF=1*10^-9F) Homework Equations where d is the distance between the 2 sheets...

yes I think I see the connection.. 0.12 = (1/2)t/1.28billion?? solving for t? I don't get the right answer though ln(.12) = t/1.25billion(ln.5) is what I was trying..

Homework Statement The technique known as potassium-argon dating is used to date old lava flows. The potassium isotope 40K has a 1.28 billion year half-life and is naturally present at very low levels. 40K decays by beta emission into 40Ar. Argon is a gas, and there is no argon in flowing lava...

Oh okay thank you for the clarification! I was able to get the answer :)

Homework Statement A Jaguar XK8 convertible has an eight-cylinder engine. At the beginning of its compression stroke, one of the cylinders contains 499 cm^3 of air at atmospheric pressure (1.01 x 10^5 Pa) and a temperature of 27.0 degrees celsius. At the end of the stroke, the air has been...