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Mission To Mars - Space Rescue & Fuel Usage
(Been a while since I saw the movie.) When the wife jets off the supply shuttle (?) at Mars after her husband, she has to stop just out of reach of her husband. Distance would not matter. All she would need is to go faster than her husband, which she was.
She also set her fuel warning at 1/2. This is wrong. Assuming that she massed as much as her husband she could only use 1/4 tank of fuel to launch, 1/4 to slow down, and 1/2 to accelerate her and her husband back to the shuttle. They could impact the shuttle to stop or let the other astronauts catch them.
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Rated 6.2/10 (26 ratings) Your opinion?
Special Requirements: watch the movie
Contributed By: Anonymous on 08-07-2000 and Reviewed By: Webmaster
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Capman writes:
Well guys, According to the New York Institute of Astro Physics: Mass/Velocity = (Gravity x Atmospheric Density). Let us look at the Equation for this situation: 3.335/65.2(2.3 x 0.74555). This equation clearly tells us that these two astronauts are actors and that this is a movie. If the director had to follow the rules of Astro Physics it wouldn't make for an interesting movie. Do we really have to be this technical when watching a movie?
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El Gran Emperador writes:
Actually, it is possible that she would not have to do anything at all. If the guy(Tim Robbins) had something on him that he could throw(I think he had something in his pouch) he could throw that in the opposite direction he is wanting to go, and let go of it. That would make him go in the opposite direction of whatever it was he was throwing. The reason: whenever you place a force on something, that something places a force on you.(Newtonian Physics; very simple.)
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Roxana writes:
It seems to be a general misconception in science fiction that in the weight-less environment of space fuel would be required to start moving but one could slow down or stop by simply using less or no fuel. Because of inertia it requires fuel to slow down or stop is space. In many movies and books someone turns back to the ship because they have consumed half their fuel. In actual fact they would never make it back. They used half their fuel to get at whatever speed they are traveling and now they will need the other half to slow to a stop, leaving none for the return trip. Fuel warnings should be set at 1/3 or 1/4, depending on whether you plan to stop by crashing into a ship, where 1/3 fuel could be use to travel, 1/3 to stop, and 1/3 to return, leaving none for slowing down. If you want a more pleasant landing, you want 1/4.
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bored outta my mind writes:
I agree completely, and picked up on this myself... she wouldn't need to use all her fuel to get to woody... once she started to accelerate, she would continue to travel at whatever speed she accelerated too... she only needed to thrust for a few seconds to accelerate to go faster than woody was, then she would continue to travel toward him at that speed even with no thrust. She only needed fuel to slow down when she got to woody, then to accelerate and float back, again in the same situation: she would turn around and then thrust for a few seconds to build speed, then she would float at that speed back toward the REMO. But hey, its a movie and woody's death was only in there for dramatic effect so I'm not gonna complain about it.
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Red 5, standing by writes:
I agree wholeheartedly. I don't plan on trying to figure out the logistics of the actual fuel consumption because there are too many variables, but the fact of the matter is that both people shouldn't have had to use all of their fuel. First, if Tim Robbins was going 30-35 mph when he hit the lander(or whatever it was called), he was abviously travelling far faster than he needed to. Second, and this is basically the same argument, when his wife went after him, she basically didn't need to use her fuel to stop - she could have just continued on to him and then used her fuel to get them headed back in the correct direction. Outside of that, I really liked the rest of the movie.
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Trp writes:
Well there was not an infinite amount of tether in the gun, so he had to get to the REMO as soon as possible. It's not like Woody nor Terry had all the time in the world to do what they had to do. If you remember the whole burning up in the atmosphere and length of tether. All in all I believe you are being too picky.
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Pie is good writes:
What? What Gran said made no sense. In SPACE if you through something in one direction you won't go in the opposite direction. Whatever you threw will just go in whatever direction you threw it in and slightly to the direction that you are moving because that is where it started. The force of the object won't change your speed or direction unless it is heavier than you. Then whatever direction you pushed of from the heavier object is the direction you would go in.
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