You talk about slingshots around other planets. While this is a well-established technique these days to gain speed or whatever, something isn't quite clear to me. How can you gain speed by such a technique? Ok, falling down to a heavy object and then leaving it behind will indeed speed you up in the intermediate phase and will indeed get you across that certain distance much faster than without the gravitational pull, but as a net result you will not have gained speed. So one could think that this "slingshooting" just involves crossing certain parts of the path from a to b faster by these gravitational wells, but that is not exactly how they do it I think. If you look at flightpaths taken by certain probes, these seem totally irradic, using the same planets multiple times... So this is certainly not just "speeding up" in some pieces of the trip. Can someone explain why and how you can speed up/shorten travelling time by using planets as slingshots? Thanks
Here in our neighbourhood in Belgium there used to be some smartshops, small semi-legal stores where they sell all kinds of herbal extracts, non-subscription drugs,... They once sold caffeine caps of 500 mg caffeine, which would be the equivalent of around 25 cups of coffee. Once ate one of those, did have a hell of a party afterwards, but I experienced actually no real (short-term) negative effects, except some hyperactivity, nervosity and a lot of thirst. Of course taking four of those guys I wouldn't promote...
embed your lander in a large quantity of something that has pH 14. The heat generated in this reaction could get some serious melting done. Or use this as a source of energy.
I wonder how hard you would have to blow to get any dust moving when the atmospheric pressure is about 5-10% of what we have here. You don't want to create a miniature sandstorm in your direct environment I would think. It is probably ok for very fine dust, but what with larger and coagulated grains of dust?
First, the speed at which even mars moves with respect to the earth is zilch compared to the speeds at which this effect becomes visible, let alone the rotation.
Second, i don't think there is one living creature (on earth) that subconsciously compensates for this effect.
For instance, lets say the earth rotates at 1000 m/s (this is way too fast). The speed of light is 3*10^5 times bigger, so this causes a shift in frequency of order 10^-5 (very raw calculation). This is not visible.
You fill it up with warm water when it is near the surface, then you descent. Very deep under water the temperature is at a constant of 4 degrees Celsius (then water has the greatest density). You schield the warm from the cold water with semiconducting plating that can generate electricity when a thermal gradient is applied. This is called the Seebeck-effect (google for more info). You use this energy to charge a battery. With this power you compress or decompress a certain volume of air, so that the total density of the sub switches between a bit below 1 and a bit above. By placing your airtanks asymmetrically you can make it nosedive or noselift. The wings do the rest.
and these REALLY sound the same if french isn't your native language (It isn't mine either). Can you imagine the translation of "a green worm in a green glass"?
O.K. exlain how thick sheets of ice can persist for eons in a vacuum.
Ice is the solid state of water, and should sublimate in vacuum... But then also should iron (mostly solid, but also melts and evaporates), rock, glass,... The reason it doesn't is that the cohesion-forces between the molecules are too big to allow fast evaporation. It does evaporate, no doubt about that, but so slow it could indeed be there for a very long time. This is not the case for liquid water. there the intermolecular forces are way too small to prevent sudden evaporation.
uh, I think you better check your physics-course before posting such nonsense. Imagine, reaching 350 feet up in the air by going the measly speed of 40 mph...
Second, the gravitational constant of mars is far less than that of earth (too lazy to go check it out). You could pee over fifteen people in a row on mars.
Thirth, you dont need to land vertically. Bouncing off at an angle of 45 degrees is the most effective to reach long distances (if you forget about friction with the atmosphere).
Remember: x(t) = x0 + v0*t + g*t*t
you know those picture-thingies for children that change scene when u turn them? It works almost the same: The trick with these pictures is that actually both pictures are closely interlaced (so narrow vertical lines of each picture switch one over the other). Then they just add a top-layer of long narrow vertical triangles so that they act like little prisms (or like mirrors if u don't really know how a prism works). Then if u turn the picture around you will see first only the left stripes (thus looking like the first picture), later only the right stripes.
Now if you make such a thing not out of cheap plastic, but put some more care in it, you use vertical stripes of pixels instead of paper, and you carefully design this thing so that at certain angles your left eye sees the left picture and your right eye the other, BAM, you've got depth perception without glasses or such.
But I can imagine the following disclaimer: "only works at certain angles and places. We are not responsible for severe neck-stifness"...
If this phone recognizes "patterns of behaviour" the same way my proggy did at my exam of AI, I guess you'll end up with a pretty interesting leisure time.
PS: I was flunked
You can compare the human brain with a MASSIVE parallel computer, where each processor is incredibly simple. The human brain has about 50 billion neurons, of which each is connected to an average of 5000 other neurons. Each "wire" has a specific thickness, and each neuron doesn't do much more than just add all the incoming signals together, and become active if this total signal exceeds a certain treshhold. Nothing more...
Sounds simple, but ever thought of how to let a computer do this? (50 billion times 5000 wires, 50 billion parallel summations per cycle,...)
Slashdot Mirror
Here in our neighbourhood in Belgium there used to be some smartshops, small semi-legal stores where they sell all kinds of herbal extracts, non-subscription drugs, ... They once sold caffeine caps of 500 mg caffeine, which would be the equivalent of around 25 cups of coffee. Once ate one of those, did have a hell of a party afterwards, but I experienced actually no real (short-term) negative effects, except some hyperactivity, nervosity and a lot of thirst. Of course taking four of those guys I wouldn't promote...
embed your lander in a large quantity of something that has pH 14. The heat generated in this reaction could get some serious melting done. Or use this as a source of energy.
mark, your post is the "mother-of-insightfull-posts". It should be obligate literature in the entire USA :)
I wonder how hard you would have to blow to get any dust moving when the atmospheric pressure is about 5-10% of what we have here. You don't want to create a miniature sandstorm in your direct environment I would think. It is probably ok for very fine dust, but what with larger and coagulated grains of dust?
First, the speed at which even mars moves with respect to the earth is zilch compared to the speeds at which this effect becomes visible, let alone the rotation. Second, i don't think there is one living creature (on earth) that subconsciously compensates for this effect. For instance, lets say the earth rotates at 1000 m/s (this is way too fast). The speed of light is 3*10^5 times bigger, so this causes a shift in frequency of order 10^-5 (very raw calculation). This is not visible.
You fill it up with warm water when it is near the surface, then you descent. Very deep under water the temperature is at a constant of 4 degrees Celsius (then water has the greatest density). You schield the warm from the cold water with semiconducting plating that can generate electricity when a thermal gradient is applied. This is called the Seebeck-effect (google for more info). You use this energy to charge a battery. With this power you compress or decompress a certain volume of air, so that the total density of the sub switches between a bit below 1 and a bit above. By placing your airtanks asymmetrically you can make it nosedive or noselift. The wings do the rest.
"vers": worm
"vert": green
"verre": glass
and these REALLY sound the same if french isn't your native language (It isn't mine either). Can you imagine the translation of "a green worm in a green glass"?
Ice is the solid state of water, and should sublimate in vacuum... But then also should iron (mostly solid, but also melts and evaporates), rock, glass, ... The reason it doesn't is that the cohesion-forces between the molecules are too big to allow fast evaporation. It does evaporate, no doubt about that, but so slow it could indeed be there for a very long time. This is not the case for liquid water. there the intermolecular forces are way too small to prevent sudden evaporation.
uh, I think you better check your physics-course before posting such nonsense. Imagine, reaching 350 feet up in the air by going the measly speed of 40 mph... Second, the gravitational constant of mars is far less than that of earth (too lazy to go check it out). You could pee over fifteen people in a row on mars. Thirth, you dont need to land vertically. Bouncing off at an angle of 45 degrees is the most effective to reach long distances (if you forget about friction with the atmosphere). Remember: x(t) = x0 + v0*t + g*t*t
That should have been "Operation Iraqi Liberation" at first, until they realized what the abbreviation would be...
you know those picture-thingies for children that change scene when u turn them? It works almost the same: The trick with these pictures is that actually both pictures are closely interlaced (so narrow vertical lines of each picture switch one over the other). Then they just add a top-layer of long narrow vertical triangles so that they act like little prisms (or like mirrors if u don't really know how a prism works). Then if u turn the picture around you will see first only the left stripes (thus looking like the first picture), later only the right stripes. Now if you make such a thing not out of cheap plastic, but put some more care in it, you use vertical stripes of pixels instead of paper, and you carefully design this thing so that at certain angles your left eye sees the left picture and your right eye the other, BAM, you've got depth perception without glasses or such. But I can imagine the following disclaimer: "only works at certain angles and places. We are not responsible for severe neck-stifness"...
yup. Let's all go back to good ol' 28.8 modem, that'll teach them!
If this phone recognizes "patterns of behaviour" the same way my proggy did at my exam of AI, I guess you'll end up with a pretty interesting leisure time. PS: I was flunked
You can compare the human brain with a MASSIVE parallel computer, where each processor is incredibly simple. The human brain has about 50 billion neurons, of which each is connected to an average of 5000 other neurons. Each "wire" has a specific thickness, and each neuron doesn't do much more than just add all the incoming signals together, and become active if this total signal exceeds a certain treshhold. Nothing more... Sounds simple, but ever thought of how to let a computer do this? (50 billion times 5000 wires, 50 billion parallel summations per cycle, ...)