Physics B Main topics in Thermodynamics.

Test Preparation AP Test Preparation
1

<p>I haven't started much of Thermodynamics yet. It's the only section left for me. What topics should I focus on the most? The FR PV diagrams? Should I just memorize all of the equations and plug numbers in? Can someone just memorize the equations and "plug them in?" Is it really that easy or are there tricks to it. I've seen a lot of questions say work done ON the system and work done BY the system. Does that refer to the U=Q+W, W=-PV equations? Are the negative signs needed?</p>

<p>Basically, what should I study in Thermo given 2 days time?</p>

2

<p>Temp (Celsius)= Temp (Kevin)- 273
Thermal expansion equation
PV=nRT
P1V1/T1 = P2V2/T2
U = Q + W
all of the processes (adiabatic, isobaric, isochloric, isothermic)
e = W/ Q
e (ideal) = T(hot)- T(cold) / T(hot)</p>

3

<p>I have a question about thermo graphs.</p>

<p>If the graph is, for example, a square, then the work done would be the area inside the square. But how do you determine if the work done is done BY the gas or ON the gas? I know you look at which direction it goes... but then what?</p>

4

<p>You'll be able to study thermo in 2 days, there isn't much except what others have said so far and carnot engine and efficiency. It's quite easy</p>

<p>And much better than trying to cram electricity in 2 days :)</p>

5

<p>If you use U = Q +W, if the work is postive, the work is done on a gas. If work is negative it is done by the gas.</p>

6

<p>damn. I don't think my class even did thermo.... time to get a study book, suggestions on which one?</p>

7

<p>5 Steps to a 5.</p>

8

<p>I am not all that great in physics, but it is important to remember that the change in internal energy only depends on the temp of the gas (assuming amt of gas stays the same).</p>

9

<p>hey i need the 2004 physics b test please if u have it im willing to trade or pay my aim is <a href="mailto:bob.collgebound@gmail.com">bob.collgebound@gmail.com</a></p>

<p>please respond ASAP</p>