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AP Physics 1: 3.2 Waves 8 Views


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AP Physics 1: 3.2 Waves. What is a possible length of the string?

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English Language

Transcript

00:00

Thank you here's your shmoop du jour brought to you

00:05

by standing waves Although we've been working on a lot

00:08

of this physics stuff we'd prefer sitting wave Just get

00:11

some rest all right A string is held taut and

00:14

its tension results in a fourth harmonic standing wave With

00:19

a wave velocity of ten meters per second Hugh walks

00:23

over and grabs it fifteen centimeters from one end in

00:27

an attempt to interfere with the wave If this action

00:30

doesn't affect the way of what is a possible length

00:33

for the string and hear the potential answers and be

00:36

sure you really kind of figure out what's going on

00:38

here right so hugh here just has to mess with

00:41

the string Some people take hands on physics a little

00:44

too literally but if he grabs the string at a

00:46

certain point and it doesn't affect the wave that means

00:50

he's grabbed it at one of the waves Notes Well

00:53

that's a good piece of info to know we'll let

00:55

you off easy this time but next time he's exiled

00:57

from the study A fourth harmonic standing wave means there

01:03

are four anti notes and five notes counting the nodes

01:07

at each end of the string and that means that

01:09

there are three other notes One has to be in

01:11

the middle and the other two are at one quarter

01:14

and three quarter points along the string so fifteen centimeters

01:18

has to equal one quarter of the strings length one

01:22

half of the strings length or three quarters of the

01:25

strings length Doing the math shows is that a fifteen

01:28

centimeters is a quarter of the strings Length in the

01:30

string would be sixty centimetres long If fifteen centimeters is

01:35

the halfway point then the string has to be thirty

01:37

centimeters long which is great But neither of those are

01:40

included in our possible choices But a fifteen centimeters is

01:44

three quarters of the strings length than the whole string

01:47

is twenty centimetres long Got it and that's one of

01:51

our choices So the correct answer is d okay now

01:54

we're really beat it's bedtime for us but have no 00:01:57.511 --> [endTime] fear Physics never sleep

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