Recent content by crashdirty86

Homework Statement What is a state function? How is it different from a scalar quantity? Use the expression ΔH=q as an example. Homework Equations The Attempt at a Solution So the way I am interpreting this question is that a state function is a reference to say the temperature...

I would also keep in mind that W=-qV=- change in electric potential energy.

When you talk about a pd it is always some final minus initial, thus the potential difference between two points. So when you look at a pd across a battery with internal resistance, the pd will be that between the two points measured across the battery. Thus, when an EMF from a battery has a...

So, I see no internal resistance in the first diagram. This would lead me straight to answering b. For the second the p.d. across R would cause a drop in V coming out of the battery. Even though the internal resistance would drop the immediate, its the p.d. that drops the V applied to the...

So this is a late response, but I do have the concept down for finding the voltage on the inductor when the switch is opened at t'=0. Since the current inside an inductor must change continuously, then the current flowing through the inductor must be the same as the current flowing through...

Well if the current through the inductor is 0.48 A and the switch is open, then we have a series of elements which means that the current through resistors 1 & 2 would also be 0.48 A.

So the current through the inductor when the switch is opened should be 0.48 A. Giving a voltage of 2.4 V on the inductor, 12 V on resistor 2 and 7.2 volts on resistor 1? This seems odd... I feel like I have broken the law of conservation on energy?

Okay, so after a long time the inductor acts like a wire which I can then find the current acting on resistor 2. Once the switch is opened, then that current through two will be the current through the inductor which I can then use to find its voltage?

The current will change continuously, so the current through the inductor should be 0.3 A i do believe.

anyone want to attempt to help?

Homework Statement at t=0 switch S is closed. Just after the switch is closed what are i1, i2, the potential difference across V2 across resistor 2, and Vl across the inductor? A long time after the switch is closed, what are i1, i2, V2, and Vl? Emf = 12V, R1= 15 ohms, R2 = 25 ohms, and L...

If you get a rubber band, does it already sit at full length or is it laid in some weird oblong shape? In my mind, you would be doing some small amount of work to have the rubber-band laid out in a way to measure its full, unstretched, initial length. From this perspective, you then begin to...

Homework Statement The figure below shows two circular regions R1 and R2 with radii r1 = 20.0 cm and r2 = 32.9 cm. In R1 there is a uniform magnetic field of magnitude B1 = 52.4 mT directed into the page, and in R2 there is a uniform magnetic field of magnitude B2 = 75.6 mT directed out of...

Look dude, its called a learning process. I'm not here for you to try and talk down to me. I asked for help, not a smartass. Simple mistakes are made in everything a person intially unfolds to create a roadmap to success,but I guess for you that would be impossible since your Mr. Perfection.

The 12 kN comes from concentrating the linearly distributed load at it's centroid location along the beam. As far as the check goes, I was just struggling with finding my equations to draw the diagrams. This was because of the multiple forces compiling altogether through out the beam. Not a...