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Originally posted by Phage
Nope.
The force is proportional to the product of their masses.
Originally posted by weedwhacker
However, now it gets complicated....the Earth/Moon 'system' (almost could be considered a double planet) could be simultaneously influenced by the Sun's gravity....hence, the uncertainty of the Moon's orbit, in the next five Billion years.
Originally posted by Phage
reply to post by mikesingh
My tire pressure on my car (if I'm paying attention) = 30psi
Atmospheric pressure at sea level = 14 psi (+/-)
Atmospheric pressure in space = 0 psi
Pressure differential between space and my house: 14 - 0 = 14 psi
My tire pressure in space: 30 + 14 = 44psi
Give me a break, I've accidentally gone up to 60 psi and my tire held. 14 psi differential is peanuts.
If my tires pop at 44 psi I'm going to be really, angry. I will stomp my feet. I will jump up and down. Luckily, I will still be on Earth so I won't hit the ceiling.
[edit on 12-9-2008 by Phage]
Originally posted by Grayarea
You are partly correct, just add the ultra-high vacuum of space to the formula(vacuum increases with distance from earth) and I'm sure you could design a tire for space.
Originally posted by jra
What kind of "extraordinary feats" are you looking for?
Jumping high? They did that. Armstrong jumped up from the ground to the third step of the LM ladder. That's about 5 to 6 feet.
An astronaut on a different mission (I forget which one at the moment) did some free standing jumps. He got up to about 4 feet, but again, due to the PLSS on his back which affects ones center of mass. He tipped over and landed on his back. He was very lucky that no damage happened to his PLSS.
Also, astronauts weighed more than 180lbs. With a fully loaded space suit they were about 300lbs which is about 50lbs on the Moon.
And don't forget that they still have 300lbs of mass regardless of the amount of gravity.
And when you're comparing how high some one jumps on Earth to that of the astronauts on the Moon. Are you comparing it to some one wearing the same space suit on Earth? It would only be fair, since those suits are heavy, bulky and stiff.
What leads you to believe that the plumes should have been 60 feet high? What calculations lead you to that conclusion?
The fact that the dust returned to the ground shows that there is indeed no atmosphere (or not enough of one) to affect the particles of dust.
The problem I have with this, is that it doesn’t appear to be dust devoid of moisture; if it is in fact dust. I’m more inclined to guess that the particles being dispersed by the rover are more to the likeness of fine clay.
If there were an atmosphere, the dust would have remained suspended in it, like it would on Earth. But it all falls with no atmospheric resistance. The dust "waves" have nothing to do with an atmosphere. They're caused by the rover bouncing up and down as it drives over the bumpy surface.
Yes, but in the absence of an atmosphere and in low gravity conditions, you would expect the “dust” to be propelled further and faster into the “air”.
You can clearly see that the rover is bouncing as it's moving and the tires kick up more dust when they dig into the ground more, creating "waves". Have you ever witnessed a car driving down a dirt road? The dust clouds and billows and remains suspended in the air for a while. It looks nothing like what's shown in the video of the Rover.
Originally posted by weedwhacker
reply to post by JPhish
JP....you tore apart jra....and I do not ever do that, I really am appalled when people take a selected quote, then respond....
I assumed he had his hands on the ladder, because that’s the only way it would make sense. I didn’t want to jump to conclusions in opposed to what Jra was saying though, because I’ve not actually seen that video.
Armstrong knew he could get back up....at least, in the simulations on Earth. AND, it wasn't (sorry jra) just about jumping....he had his HANDS on the ladder, folks!!! Sheesh!! If you 'weighed' about 65 pounds, couldn't you pull yourself up a little bit?
So, next sillly argument?