Recent content by mjjaques

Hi, I have this voltage doubler circuit that we built in lab: We're told that, with the jumper inserted, the output voltage is about twice as great as without the jumper. We didn't need to prove this theoretically, but for my own curiosity, I was wondering if someone could give a clear...

So before connecting the jumpers, V_A and V_B are already equal, using the voltage divider equation right? They're both 2.5 V. If they weren't equal before, would there be a current through the jumper?

Homework Statement There are several parts, but the part I'm stuck on is: what happens if a jumper is placed from node A to node B? Calculate V_A and V_B, and magnitude and direction of the current through the jumper. The resistor values are R1=R2=2 kohms, R3=R4=1 kohm. Homework Equations...

Well, we would want to use pipe for the actual cold finger because it's solid, and then tubing for the liquid nitrogen to go in and out. What about a hose barb like this...

Yeah, it will look like the one on the left. We don't want to use copper, because we are doing this under a magnetic field, and aluminum will interfere with the results less. The problem we're having is how to make those "nozzle" things that the tubes (with liquid nitrogen) attach to. If we...

Well, Pyrex scratching on aluminum could break the Pyrex, right? Whereas it doesn't really matter if an inner aluminum rod gets scratched from the outer one. I could be completely wrong, but our professor doesn't like the idea of having it made of Pyrex for some reason...

Hi, I've looked everywhere for some advice on this, I hope someone can help. We are making a cooling system for cooling thin films, and part of that setup is a liquid nitrogen-cooled cold finger. This cold finger will be inside an aluminum tube, and will move closer and farther away from the...

So, if FT=mg then, wouldn't the answer to part (a) be (6.75 kg)(9.8 m/s2)(4.00 m) = 264.6 J? But that would make the total work equal zero, with gravity doing -264.6 J. The back of the book says the answers are (a): 3.60 J, (b): -.900 J, (c): 2.70 J

Homework Statement An old oaken bucket of mass 6.75 kg hangs in a well at the end of a rope. The rope passes over a frictionless pulley at the top of the well, and you pull horizontally on the end of the rope to raise the bucket slowly a distance of 4.00 m. (a) How much work do you do on the...