AP Physics 2: 2.1 Probability and Systems

AP Physics 2: 2.1 Probability and Systems. During which of the following sequences is the energy change equal to zero?

AP Physics 2Probability and Systems
LanguageEnglish Language
Science Practice 1Using representations and models

Transcript

00:17

pressure volume diagram Right here Here we go The path

00:20

from point c to point a is an ice Oh

00:23

thermal expansion and the number of molecules is such that

00:26

the number of molecules times bowl timmons constant equals the

00:30

number of malls times the gas constant which also equals

00:33

one jule per kilogram During which of the following sequences

00:37

is the energy change equal to zero There you go

00:41

Pointing at point b b c c a and here's

00:44

a potential answers Yeah we're on the numeral time Yeah

00:47

That's what i got right So we're talking about a

00:49

change in energy here being a change in temperature The

00:52

equation for the ideal gas law is pressure times Volume

00:55

equals the number of moles times the gas constant times

00:58

temperature The number of moles in the gas constant will

01:01

stay the same here After all we're not taking any

01:03

gas away and the gas constant is well constant So

01:07

in order for the temperature not change in the product

01:09

on the left side of the equation has remained the

01:11

same Let's Look at this diagram again Moving from a

01:15

to b means the volume will change but the pressure

01:17

will stay the same and moving from b to c

01:20

means the pressure will change but the volume will remain

01:23

stable Neither of these scenarios the pv side of the

01:26

equation real result in a change of temperature But in

01:30

the change from c t es the pressure lowers the

01:32

volume increases The left side of the equation will remain

01:36

the same and the temperature energy won't change So the

01:39

correct answer is c in a pressure volume equation the

01:43

variables are dependent on each other So if one part

01:46

changes other parts will change too Just like if we

01:49

eat less our stomach pressure reduces as does our happiness 00:01:53.502 --> [endTime] But that's not a trade we're willing to make