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AP Physics 2: 1.5 Probability and Systems 5 Views


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Description:

AP Physics 2: 1.5 Probability and Systems. Which of the following statements are true?

Language:
English Language

Transcript

00:03

And here's your shmoop du jour brought to you by nuclear reactions [Nuclear bomb explosion]

00:07

we've actually been able to create nuclear reactions at home not by chemistry

00:12

or anything but you know just by hiding our sisters iPhone alright well this [Sister looks annoyed with her brother]

00:16

year's Homecoming activities involve a local version of The Amazing Race and [Two people racing]

00:20

the roadblocks contain physics challenges the card says a general

00:26

nuclear reaction is written as follows (mumbles) where Q denotes the [The question being written out]

00:32

disintegration energy, alright which of the following

00:36

statements are true? Select two answers, yeah two...

00:41

Well physics questions on The Amazing

00:43

Race ha it wouldn't even be a competition as long as we didn't have

00:47

to eat lamb intestines or anything or or lift heavy things or or have to run [People look grossed out by the plate of intestines]

00:52

yes you know what maybe the Amazing Race isn't our game we'll stick to Mario Kart [Kid playing Mario Kart on the TV]

00:56

Okay lucky for us this question is pretty straightforward the Q value of a

01:00

nuclear reaction refers to the amount of energy released by that reaction so if

01:04

the Q value is positive that means the nuclear reaction produces energy it's

01:09

exothermic or exoergic or exergonic depending on which fancy-pants words we [Pants with the different type of reaction written on them]

01:15

want to use today not to go all AP English on you but we can see that these

01:19

all have the root exo in them for those of us who slept through AP English [Kid asleep at his desk]

01:24

that's a Greek root which means outside or beyond sort of like how an exorcism

01:29

means getting a demon outside of some creepy little girl in that stupid movie [Kid stood in a dark living room]

01:32

that totally didn't scare us we just want to sleep with the lights on for a

01:36

few weeks now, anyway in this context it means something comes out of the [Kid is sick in bed]

01:40

reaction so A is one of our correct answers if the Q is negative though that

01:45

means the reaction absorbs energy that's endothermic or endoergic or endogonic

01:51

and why hasn't someone made an endorcism movie yet where a demon was placed ['The Endorcism' book appears]

01:55

into a creepy little girl, great now we'll need the

01:59

lights on for a month but it looks like C is our other correct [Kid jumps into bed looking scared]

02:02

answer because an endothermic reaction always requires the input of energy

02:08

it can't happen spontaneously, so B is wrong and if there's an exothermic

02:12

reaction energy is being produced so an input of energy isn't required which [Exothermic reaction with energy sparks coming from it]

02:17

means D is also wrong of course our sisters nuclear reactions are both

02:21

endothermic and exothermic they require energy to find her phone but it produced

02:27

energy when she threw the phone at us and clocked us in the head she just [Phone hits the brother in the head and he falls to the floor]

02:30

doesn't understand the things we do for science..

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