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AP Physics 2 Videos 59 videos

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AP Physics 2: 2.1 Probability and Systems 171 Views


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

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Transcript

00:00

Thank you We sneak and here's your shmoop you sure

00:05

Brought to you by pressure and volume there's a relationship

00:08

between pressure and volume As in when we eat three

00:11

cubic leaders of mac and cheese the pressure on our

00:13

stomach reaches well Epic proportions Take a look at this

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

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