# Question 19 - Apollo 13/Newton in the Driver's Seat (1 Viewer)

#### Captain Gh3y

##### Rhinorhondothackasaurus
What everyone write for this?

"Lovell was referring to the fact that the laws of gravity were now in control of the spacecraft, as these were discovered by Newton". I then described all the factors for re-entry, mentioned how he had no fuel and so he coudln't change the rocket's mometum again, and made a half-assed attempt at explaining how gravity and rocket trajectories work (seeing as it's not in the syllabus there wasn't much I could think of for this part)
And then concluded saying that the statement is justified because it means that the laws of physics, particuarly gravitation, are in control of the spacecraft.

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#### charred remains

##### New Member
The question was fucked with a foetus and should die.... But basically I wrote about slingshot/newtons laws since they talked about newton, and people dying, which was a subtle metaphor for the writers of this quite fucked exam.

Fuck... I don't think I spoke about reentry, although to be fair the question wasn't worth the effort.

#### Dumsum

##### has a large Member;
LOL I almost laughed when I saw this question. I had no idea what it was going on about. But what I described was Newton's concept of escape velocity, and how when something is in orbit an extra boost in speed will allow it to escape the gravitational field. This is similar to what happened with them.

#### mAtboisLim

##### Member
I said that Newton's third law is the rocket propulsion equation.

-F(gases) = F(on rocket)

I said that this force was required to get the rocket into escape velocity, to escape the gravitational field of the moon.

I then said that once the moon's field was escaped, Newton's Universal law of Gravitation predicts that the rocket will be attracted towards the earth.

#### sunjet

##### Hip-Hop Saved My Life
I talked about slingshot effect and gravity assist and burning of fuel.

#### darkwarrior2

##### Member
its slingshot effect + newtons universal law of gravitation, its an assist maneouvre.

#### Jago

##### el oh el donkaments
gravitational assist and entry window.

#### Rekkusu

##### Currently: Away
Yeah I went with Gravitational assist and law of gravitation, since these two were like directly linked with Newton...kind of talked about slingshot as well.

#### serge

##### Member
i did everything's attracted to everything else
for a slingshot effect
and then then at the end the rocket uses
propulsion from every action having an equal
and opposite reaction

#### exa_boi87

##### aka biomic
yeh i did escape velocity, newtons law of univerasl gravitation and slingshot ....

#### darkwarrior2

##### Member
im not sure if you need escape velocity, seeing as the rocket doesnt "escape" anywhere, it just uses the moons orbital velocity to assist in reaching earth.

##### New Member
slingshot effect, escape velocity.

Note that escape velocity is needed, how else is the shuttle will go back to earth if its KE is not > GPE with respect to the moon?

#### serge

##### Member
darkwarrior2 said:
im not sure if you need escape velocity, seeing as the rocket doesnt "escape" anywhere, it just uses the moons orbital velocity to assist in reaching earth.
it escapes the lunar orbit,
(it was actually written in the question)
gay, i should have used that

dang, beat to it

#### richz

##### Active Member
yeah, kinda gay q, i just said the statement was true, i related escape velocity to slingshot affect, saying they needed the slingshot effect to obtain the v needed to esapce the grav pull.

#### KFunk

##### Psychic refugee
Figuratively speaking Newton was in the driver's seat 'cause the motion of the shuttle/rocket thingo was due to newton's laws and his eq'ns of gravity. It was more like an english task - explaining the function of figurative speech in language and how the Newton reference made sense contextually.

#### pravski

##### Member
newton in drivers seat because he went in a straight line from earth to moon, i.e. first law.

No friction and weak gravity, therefore travels in straight line and it reached earth so you know that the law was obeyed

you dont need escape velocity etc

#### jess_83839

##### New Member
i talked about slingshot, F gravitational, acceleration, and some sort of the 'reverse' of the concept of escape velocity formulated by Newton (since the probe is coming back to the earth). i dont understand why it asked for 'newton's in the driver's seat, still...

#### serge

##### Member
pravski said:
you dont need escape velocity etc
you can use any of Newton's laws/ theories...
escape velocity is one of them

#### richz

##### Active Member
i agree, because they have to escape the moon's grav pull. BUt it was kinda gay, maybe i didnt read the entire q but was it me or did it say the spacecraft exploded?? if it did wouldnt they all die? lol, it didnt say they escaped lol.

But then again i dont read the q much lol

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#### chensta

##### Member
it says after the rocket completed its burn, so that means it has to be out of moon's orbit already? cause it needs the rocket to 'push' it out, so we are explaning things from that moment on, which pretty much means that the rocket nolonger experiences external forces, therefore maintains its velocity towards earth and reaches earths atmosphere.....thats all there is to do with newton, once it reaches earth atmosphere, re-entry etc has nothing to do with newton, well there is gravity pulling it down, but i dont think that'll relate to the question