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AP Physics 1 Videos 86 videos

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AP Physics 1: 2.4 Fields in Space 239 Views


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Description:

AP Physics 1: 2.4 Fields in Space. Which of the following would help bring the satellite into this new orbit?

Language:
English Language

Transcript

00:00

Thank you We sneak and here's your shmoop du jour

00:05

Brought to you by space junk man The intergalactic police

00:08

should really have stricter laws to help produce alien littering

00:11

Alright Thanks to space junk a satellite has been bumped

00:14

from its previous circular orbit into a new circular orbit

00:18

The technicians on the ground report that the satellite is

00:21

now orbiting at a distance ten percent greater than it

00:23

was previously Which of the following would help bring the

00:26

satellite into its proper orbit And here the potential answers

00:30

rockets to speed it up Slow precinct transporting cargo All

00:36

right so we've got a satellite in orbit and the

00:38

distance of its orbit has changed What we need to

00:41

understand is how the mass and velocity of the satellite

00:44

affect its orbital distance Well the equation used to calculate

00:47

the velocity of an object orbiting the earth is velocity

00:51

squared equals the gravitational constant times mass divided by the

00:56

objects distance from the earth That looks like this harry

00:59

thing right there It's important to remember that the mass

01:02

in this equation isn't the mass of the satellite it's

01:06

the mass of the earth the mass of the satellite

01:08

Doesn't influence this equation so we can eliminate options See

01:12

indeed Taking a look at the equation basic math tells

01:14

us that if the distance increases well velocity decreases We

01:19

can also rearrange the equation to solve for the distance

01:21

And that would look like this We're looking at it

01:24

this way We know that if the velocity increases the

01:27

distance decreases Got it So option a is the correct

01:32

answer Kind of power of the jets and lower the

01:34

satellite back to where it belongs But let's cover our

01:36

bases here We can also think about this question in

01:40

terms of proportions If we have our original equation velocity

01:44

squared equals g times mass divided by distance Then we

01:49

can compare that to the velocity and distance of the

01:53

bump satellite let's Make that equation Velocity b for bunk

01:58

squared equals g times mass divided by distance Be now

02:03

let's Put one over the other to create the proportion

02:07

like that And it'll look a little something like this

02:10

Yeah And you can rearrange that to produce the correct

02:13

velocity Well this means that the original velocity is larger

02:16

than the bump velocity because the bump distance is larger

02:19

Than the original distance as was the case here Sometimes

02:22

there are multiple ways to solve a problem so it's

02:24

important Remember that if we do get stuck on a

02:26

problem to see if there's another approach we can take

02:29

to find an answer Sometimes our brains can lock on

02:31

a one thing and not see that other past Khun

02:33

get us to the promised land Stepping back and taking

02:37

a fresh look helps clear things up And speaking of

02:39

clearing things up well how about holding these littering aliens

02:42

a little more accountable and it's a mess up there

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