# AP Physics 2: 2.1 Probability and Systems

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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?

AP Physics 2 | Probability and Systems |

Language | English Language |

Science Practice 1 | Using representations and models |

### Transcript

pressure volume diagram Right here Here we go The path

from point c to point a is an ice Oh

thermal expansion and the number of molecules is such that

the number of molecules times bowl timmons constant equals the

number of malls times the gas constant which also equals

one jule per kilogram During which of the following sequences

is the energy change equal to zero There you go

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

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

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

change in energy here being a change in temperature The

equation for the ideal gas law is pressure times Volume

equals the number of moles times the gas constant times

temperature The number of moles in the gas constant will

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

gas away and the gas constant is well constant So

in order for the temperature not change in the product

on the left side of the equation has remained the

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

to b means the volume will change but the pressure

will stay the same and moving from b to c

means the pressure will change but the volume will remain

stable Neither of these scenarios the pv side of the

equation real result in a change of temperature But in

the change from c t es the pressure lowers the

volume increases The left side of the equation will remain

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

correct answer is c in a pressure volume equation the

variables are dependent on each other So if one part

changes other parts will change too Just like if we

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