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AP Physics 2 Videos 59 videos

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AP Physics 2: 2.5 Probability and Systems 169 Views


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AP Physics 2: 2.5 Probability and Systems. In which of these cases does the entropy increase?

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English Language

Transcript

00:00

Thank you We sneak and here's your shmoop douceur brought

00:05

to you by entropy with fancy word for chaos All

00:10

right consider the following situations A pile of paper gets

00:13

organized The lake freezes to gases are brought together and

00:16

allowed teo mix that a gas undergoes a cycle like

00:22

the one described in this pv diagram here In which

00:25

of these cases does the intra pete increase select two

00:29

answers And here the choice What No complicated equations No

00:36

big number times ten to the million Physics is all

00:39

about real life and interviews all too real Well entropy

00:43

is a measure of order when the lack thereof the

00:46

more order to system is the less entropy it has

00:49

Conversely the less ordered a system is the more intricate

00:52

hat accent right now interview can increase but it can't

00:56

decrease entropy is part of the second law of thermodynamics

01:00

and simplify it Entropy means that work can be converted

01:04

perfectly into heat but he cannot be converted perfectly into

01:09

work Well the most important part of entropy for the

01:12

test is this entropy can stay the same if in

01:15

action or process is reversible if the process is not

01:19

reversible than entropy increases So let's look at our examples

01:23

First of all organizing a pile of papers results in

01:26

decreased interview wait didn't we just say entropy can't decreased

01:30

Yeah we did In this example the act of organizing

01:33

the papers creates heat energy that dissipates that's a loss

01:37

of energy in the process of work In the best

01:39

case scenario is that the total entropy remains the same

01:43

This case though we're going from a state of less

01:46

organization more organization the entropy shouldn't increase is not one

01:51

of the correct choice What about the late going from

01:54

liquid to solid As it freezes well again entropy isn't

01:58

decreasing After all solids are more organized than those wild

02:01

and crazy liquid it's watching around everywhere This is a

02:04

reversible processes we'll see When spring comes the baby is

02:08

also incorrect when two gases come together and mix though

02:11

that's not reversible You can't just go out and grab

02:16

all the molecules and put them one by one back

02:18

in there to original gases see definitely increases entropy Andy

02:24

shows a heat engine cycle that isn't reversible either really

02:27

the on ly reversible heat engine cycle is a car

02:30

not cycle and that's only theoretical and not possible in

02:34

real life so not reversible equals increase entropy He is

02:39

the other correct answer And remember next time your mom

02:42

tells you to clean up the mess in your room

02:44

just tell her that the universe always moves towards disorder

02:47

and your action and clean can only stall the collapse

02:49

not prevented so like why bother And if that works 00:02:53.233 --> [endTime] please let us know

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