Jump to content
Science Forums


  • Content Count

  • Joined

  • Last visited

  • Days Won


Janus last won the day on August 29 2009

Janus had the most liked content!

1 Follower

About Janus

  • Rank
  1. I checked out the website. In a word: Gibberish.
  2. At least 20 Moons, including or own have more elliptical orbits than the Earth does.
  3. I wish I had a dollar for every time I ran across someone who thought propagation delay can explain away Relativity. Though I must admit that the OP goes above and beyond in terms of self delusion by actually believing that he personally has discovered it, and naming it after himself.
  4. No paradox, because it will not act like shown in the video. When the arm is locked, the seesaw won't behave any differently than when the arm is unlocked and the weight is resting on the end of the arm.
  5. Another point: By just increasing your exhaust velocity by 10 m/s (about an 0.2% increase), you actually do a little bit better on the payload to fuel ratio than you do by shaving that 10 m/s off the delta v you need.
  6. " There are those who, when presented with a glass that is exactly half full, say: this glass is half full. And then there are those who say: this glass is half empty. The world belongs, however, to those who can look at the glass and say: What's up with this glass? Excuse me? Excuse me? This is my glass? I don't think so. My glass was full! And it was a bigger glass! Who's been pinching my beer? And at the other end of the bar the world is full of the other type of person, who has a broken glass, or a glass that has been carelessly knocked over (usually by one of the people calling for a larg
  7. Einstein didn't "argue" for a static universe, it was just the prevailing thought at the time he developed GR. He therefore added a "cosmological constant" to his equations to counter the tendency for a such a universe to collapse under its own gravitational pull. Later, when Hubble discovered the expansion, making the cosmological constant mute, Einstein himself called it his greatest blunder. The question now became whether or not the universe was massive enough for its gravitational pull to be able to eventually slow this expansion to a stop and re-collapse the universe at some far d
  8. I was 60 miles South of that one. I was at work. Suddenly it sounded like a group of people where running down the hall of the floor above me. I was like, "what The Heck?" for a few seconds before I realized that it was an Earthquake. I got under cover and when it was over, we all filed out. After a while, we checked the building for damage. We found outside wall in which an existing crack had looked like it had widened. We decided to keep people out of that part of the building until we could get an engineer to look at it.
  9. An accidental boost from 0.5c to 0.95c would be damn near impossible. It takes 14 times as much energy to reach 0.95c than it does to reach 0.50c. This means your accident would have to release at least 13 times the energy you already expended, and that is if all the energy went into accelerating your ship.
  10. Let's see, for Christmas I got: Destroyer of Worlds by Niven & Lerner Unseen Academicals by Pratchett from my wife. 1984 by Orwell from my daughter and The Zombie Survival Guide from my sister I haven't decided which one to start first. I just finished Me of Little Faith by Lewis Black
  11. As R. A. Heinlein put it in an excerpt from "The Notebooks of Lazarus Long": Of all the strange “crimes” that human beings have legislated out of nothing, “blasphemy” is the most amazing--with “obscenity” and “indecent exposure” fighting it out for second and third place.
  12. Because without it, this happens: Fantastic Contraption: A fun online physics puzzle game
  13. When I try the link it say that it is restricted and that I can't view it unless I by the full version. But your bringing it up reminded me of a solution that I don't think that I posted here. On another board, someone came up with the challenge of solving for U-turn so that the device continually repeats (the target enters the goal, leaves the goal, and then repeats the loop). Here is the solution I came up with. It turned out to be a little trickier than I first suspected. My first several attempts resulted in contraptions that would repeat maybe 2 or three times and then hang up.
  14. As far as the atmosphere is concerned, straight up is better. That way you are out of the thicker part of the atmosphere before you reach a high enough speed for the friction to be a problem. The reason rockets follow a curve is because they are, for the most part, putting objects into orbit and for that to happen thye have to have a high enough horizontal velocity. So rockets follow what is called a "gravity turn". They slowly level the trajectory so that wehn they reach orbital altitude they have the proper orbital velocity. Gravity turns in reverse are used to land on bodies like
  • Create New...