Americans are not on Mars, never went to the moon too - 2

[bigbrain]

Hey, super dude,<br /><br />But this is another of Nasa cartoons.<br /><br />When it takes off and lands fire and flames, when it is in hovering only some little farts.<br />Why? In hovering does it turn off its engine?<br /><br />"...the flight system is protected by a 46.3 foot diameter parachute ...<br /><br />At that height (150 feet) the parachute would have not time to open. <br /><br /><br />

 

[telfrow]

<font color="yellow">when it is in hovering only some little farts</font><br /><br /><i>Farts?</i><br /><br />Your grasp of the English language is stunning...<br /><br /><br /> <div class="Discussion_UserSignature"> <strong><font color="#3366ff">Made weak by time and fate, but strong in will to strive, to seek, to find and not to yeild.</font> - <font color="#3366ff"><em>Tennyson</em></font></strong> </div>

 

[spacechump]

Ok.....so you DON'T know that liquid propellent motors aren't just a bunch of smoke pouring out the bottom...big surprise there. <br /><br />Second: once they are at the height they want to be at they are no longer trying to fight going any higher so it takes a constant amount of thrust to keep it in one place. When it is landing it now has to slow back down as its falling so it ramps up its engines as the image shows.

 

[spacechump]

Think of it this way BB. Go outside and start pushing a car down the road (I think you're big brain will figure out that you need to set it in neutral first). At first it will be hard to get it going....cars are heavy....but once it is going the energy to keep it going is a lot less. This is called inertia. Now step in front of it and try to stop this moving car..........

 

[bigbrain]

You wrote:<br />"Ok.....so you DON'T know that liquid propellent motors aren't just a bunch of smoke pouring out the bottom...big surprise there. <br /><br />Second: once they are at the height they want to be at they are no longer trying to fight going any higher so it takes a constant amount of thrust to keep it in one place. When it is landing it now has to slow back down as its falling so it ramps up its engines as the image shows". <br /><br />There is nothing to explain in an animated cartoon.<br />

 

[spacechump]

<i>There is nothing to explain in an animated cartoon. </i><br /><br />Than we can't help you doofus because you don't want to learn anything and you have already made up your mind that its all faked anyhow. Why don't you just leave loser....

 

[yevaud]

Gee, you know, when I was in the Army, the Shuttle flew right overhead, mounted on it's 747 carrier.<br /><br />I suppose that was an "animated" movie. Same with all of the missiles I used to launch. <div class="Discussion_UserSignature"> <p><em>Differential Diagnosis:  </em>"<strong><em>I am both amused and annoyed that you think I should be less stubborn than you are</em></strong>."<br /> </p> </div>

 

[bigbrain]

You wrote:<br />"I suppose that was an "animated" movie. Same with all of the missiles I used to launch". <br /><br />Have you never tryed to brake one?

 

[yevaud]

According to you, they can't even fly, because the forces acting on said missile are profoundly different when ascending, not descending. <br /><br />By the way, how does a Harrier stay hovering? <div class="Discussion_UserSignature"> <p><em>Differential Diagnosis:  </em>"<strong><em>I am both amused and annoyed that you think I should be less stubborn than you are</em></strong>."<br /> </p> </div>

 

[spacechump]

Still no comment on my earlier post BB?<br /><br /><i>OK big brain fine.<br /><br />The planets circle the sun because they are in orbit around the sun. Point one: Any object can be put in orbit around the sun ok? Not just a planet....get that?<br /><br />Point two: Any object can also use this concept of orbits to get where they want to go. Give them the correct speed and trajectory and they use Newton's laws to get where they are going.<br /><br />Point three: That is how Spirit and Oppy and any other space probe got to where its going. All the calculations were worked out ahead of time...where the planet or moon would be, the path the craft needs to take to get there and the speed and trajectory that the spacecraft needs. All this is calculated years in advance because the planets' orbits are extremely predictable (thank Newton and Keepler for figuring out the math behind that). Once a spacecraft is launched, it is give the necessary velocity and trajectory burn to start it on its orbit. Because the sun influences its path just like its influences the planets it will predictablly pull it along a determined path given a predetermined velocity and trajectory.<br /><br />So in conclusion: They don't need to steer a damn thing. Once it is released the probe pretty much just follows its gravitationally determined path to whereever they want it to go. It checks its position using star charts every once in a while and ground controllers can determine its speed from the doppler effect of the radio signal it beams back...because given that the earth is also predictable in where it is in its orbit, this info is given to the probe as well.<br /><br />If you can't get this you're a frickin' loon. </i>

 

[bigbrain]

You wrote:<br />... They don't need to steer a damn thing ... <br /><br />No? How wonderful?<br /><br />But when the probe is close to Mars going at 30,000 kilometres per hour, would you not have to break?<br /><br />How do you do to break?

 

[yevaud]

Flip 180 degrees and burn to decelerate, or via gravity-capture. Either works. <div class="Discussion_UserSignature"> <p><em>Differential Diagnosis:  </em>"<strong><em>I am both amused and annoyed that you think I should be less stubborn than you are</em></strong>."<br /> </p> </div>

 

[spacechump]

Is this a trick question BB?<br /><br />Well when going into an orbit the probe fires its engines in the reverse direction for a prescribed amount of time and slow it down enough relative to the planet/moon for it to grab it gravitationally. The planet/moon will capture the probe with its graviational pull and if the calculations were correctly worked out it will fall into orbit....just like satellites circling the earth.<br /><br />As for landing? Well they fall right into the atmosphere and the reentry aeroshell the probe is in gets them through most of the atmosphere and sheds off most of the velocity as heat. Parachutes and/or retrorockets and/or airbags do the rest.

 

[bigbrain]

You wrote:<br />"Well when going into an orbit the probe fires its engines in the reverse direction ..."<br /><br />How can it fire its engines in the reverse direction?<br />Does the probe turn 180 degrees?

 

[spacechump]

Most of the time the probe is already heading toward its target with the engine pointing to the destination. Cassini did this so that its antenna would point toward the inner solar system. <br /><br />But probes also have reaction control jets scattered around its body to steering it <i>about its own axes</i> to direct an instrument to point at a target of interest, not to steer the actual probe.

 

[bigbrain]

You wrote:<br />"Most of the time the probe is already heading toward its target with the engine pointing to the destination..."<br /><br />Then your probes go in reverse at 30,000 kilometres per hour.<br /><br />If they turned on their engines to break, they would turn like spinning tops at that speed.

 

[telfrow]

Well, you could see that coming... <div class="Discussion_UserSignature"> <strong><font color="#3366ff">Made weak by time and fate, but strong in will to strive, to seek, to find and not to yeild.</font> - <font color="#3366ff"><em>Tennyson</em></font></strong> </div>

 

[spacechump]

<i>If they turned on their engines to break, they would turn like spinning tops at that speed.</i><br /><br />Why? Please show your work...

 

[skyeagle409]

bigbrain---How do you do to break? <br /><br />Sky---Once again, the same method the space shuttle uses to return to Earth. Does your school offer science courses?<br /><br />

 

[yevaud]

Do you know anything about Vectors, Magnitudes, or the behavior of a body in the absence of any other outside forces? <div class="Discussion_UserSignature"> <p><em>Differential Diagnosis:  </em>"<strong><em>I am both amused and annoyed that you think I should be less stubborn than you are</em></strong>."<br /> </p> </div>

 

[skyeagle409]

bigbrain---One Boeing would not be able to raze to the ground not even my building of 5 floors <br /><br />bigbrain---How can it fire its engines in the reverse direction? Does the probe turn 180 degrees? <br /><br />bigbrain,<br /><br />Yes! Afterwards, the computer--the name is either, Otto or Auto--- shifts the transmission lever next to the letter "R" on the steering column and that places the spacecraft into reverse. That also explains why space probes have rear-view windows and mirrors.<br />

 

[yevaud]

And big, fuzzy, yellow dice hanging from the dashboard!<br /><br /><img src="/images/icons/smile.gif" /> <div class="Discussion_UserSignature"> <p><em>Differential Diagnosis:  </em>"<strong><em>I am both amused and annoyed that you think I should be less stubborn than you are</em></strong>."<br /> </p> </div>

 

[spacechump]

And don't forget the pine-fresh air freshener....

 

[skyeagle409]

Yevaud,<br /><br />I wonder if bigbrain knows what dice are.

 

[yevaud]

Even if so, how could they work? Six sides? Really now...physically impossible... <div class="Discussion_UserSignature"> <p><em>Differential Diagnosis:  </em>"<strong><em>I am both amused and annoyed that you think I should be less stubborn than you are</em></strong>."<br /> </p> </div>