Recent content by ironizer

Thank-you all for the help. I figured it out myself.

KE= 3/2 RT sqrt[3RT/M] and KE=(3/2)RT/avo's number

Gas Law problem... please help Calculate the average kinetic energies of the CH4 and N2 molecules at 294 K and 574 K. I've tried every possible way I could think of. I can't get the right answer. I don't know what equation to use anymore, I've done it all and nothing works. I got all...

Okay I can see that. But I don't quite get why the Carnot engine does the isothermal compression stage. I don't see why that is necessary.

So why isn't carnot's engine dependent on the working fluid? That's what I don't get.

Well, nitrogen has a capacity of around 29 J/mol K and oxygen around the same. The point is, if there was a gas with a heat capacity of close to 0 then we could get 100% efficiency. I'm just trying to make a connection between this and carnot's theorem.

Okay I rethought this thing and here's what I got: Suppose we want to make an "elevator" that lifts 1.0332kg balls a distance of 5 meters. We have 1 mole of gas in the same square shaft 1cm x 1cm. To do this, we have these balls at a height of the cylinder when it's at room temperature and...

You don't need to prepare much for Physics, as long as you have common sense and you can think logically you're good. If you want a quick review of vectors, kinematics, momentum, energy/work, have a 5 minute look at www.sparknotes.com

Oh, you are right. Dam why am I so stupid? I'll calculate it with a removable mass. See what I get. I still think its weird how I get different efficiencies just by using different working gasses (chlorine and helium).

Something > Carnot efficiency ? WTF? So I've made a very simple, ideal model of a heat engine, and my calculations just don't match up to the carnot thing: efficiency = 1-(Tc/Th) It looks like this: I supposed a rectangular block, base of 1cm by 1cm, and a piston free to move up and down...