# s pepperchin

Senior Members

162

1. ## Time Is of the Essence!!!! Technology Is Evolving!!!

I would like to commend you on proving that you know NOTHING about the american political system.
2. ## A.M. Conservation?

the angular momentum is defined by the referance frame so at the bing bang the ere is a frame where the angular momentum is zero. This means that the universe as a whole has a net angular momentum of zero constantly. If you chose a frame in which the net angular momentum is not zero than it would still be constant it just wouldn't be zero.
3. ## Help! I have some basic questions...

The atmospheric pressure would have an effect on phase changes and PV=nRT would be an equation you could use. If you look in books on thermodynamics you can usually find a three dimensional graph for a substance which relates P,V and T.
4. ## Why ct instead of t

It depends on the equation you're looking at, the units for ct is meters or some other unit of length. so are you using length or time?

6. ## how would you define momentum?

basically you study momentum because it is conservative in some systems and so it makes the mathematics easier.
7. ## Diff b/w heat and temp

the tweaking of the sample to get a "smoothish" line doesnt change the fact that heat and temperature are diiferent concepts.
8. ## Diff b/w heat and temp

Heat has to do with energy of a substance. Temperature is the average energy of a substance. Proof that these concepts are different can be seen if we look at a graph of temperature versus time for a sample being heated. The graph levels off at the temperatures where phase changes occur. If these two concepts where interchangable then the graph would not level off, it would be a smooth line.
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