pzkpfw

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About pzkpfw

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    Molecule

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  • Gender
    Male
  • Location
    New Zealand
  • College Major/Degree
    B.Sc. Computing
  • Favorite Area of Science
    I.T.
  • Biography
    Born, grew, living, working.
  • Occupation
    Self employed programmer.

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  1. I'm assuming he or she is going for argument by incredulity.
  2. Storing Renewable Energy

    Can be done: https://electrek.co/2018/01/23/tesla-giant-battery-australia-1-million/ (here used mainly as a smoothing mechanism.) But as above, current battery technology just isn't what it needs to be, to be cost effective in the long run to be the main storage mechanism. (One alternative that always amused me, hydroelectric dams where water is pumped back up into the reservoir when power is cheap, to be used later when the power wasn't so cheap. Could also be used to "store power" from renewables.)
  3. I don't see it as useful inside the lift. If you get in and the lift starts moving, you'd have to have a "stop now" button to press when the name of the place you are going to comes up. That could be hard in a crowded lift. You also don't want people getting in the lift and watching the names scroll by before they choose a button to push. That'll slow down others. A clear list outside the lift might be useful. --- There's a local building with touch screens on each floor where you can select where you want to go, not just "up" or "down". The screen will tell you which lift to take, and when you get in the lift knows where you want to go. I presume this is all very efficient as software can juggle the demands of all the people. --- I used to take the lift to the top floor of the tallest building in Suva, Fiji. A recorded voice would introduce you to the building, then tell you the weather. Even though I would go to the top floor, it never actually finished telling me the weather. Waste of time.
  4. https://www.google.co.nz/search?q=Dictionary#dobs=paragraph
  5. mistermack, you are missing half of the point of the speed of light: it's not just a limit, it's invariable. It's constant. You keep wanting to treat it as merely a speed limit that things get compared to, but it's more than that. Every observer must measure the speed of light to be c - no matter what they are doing. If you and I are travelling towards a light source, even though we travel at different speeds towards it (which we can tell by a growing or shrinking distance between us) we both would measure the speed of light coming from the source as being c. (That's what shows us that it's time and distance that are not - relatively - constant). No other speed works like that. If we were both travelling towards a source of sound, even your blind underwater case, we'd measure different speeds for the waves of sound travelling towards us. Same with your hypothetical c/2 thing. There's no way it can have truly relativistic effects, as the constancy of c does, and be in the same Universe with the same laws. (NB: your creatures might all agree on the speed of sound - but that's relative to the water, not relative to themselves.)
  6. Most Overrated Novels of All-time?

    I'd read some Greg Bear I really liked, so was keen to try Eon, which I think is considered a classic. Finding it very hard to slog through the last few chapters. Have not picked it up in a Month. Similarly, liked a lot of Robert A. Heinlein, but never finished Stranger in a strange land. May try again one day. The Frank Herbert "classic" Dune, has already been mentioned. I thought it started well, then I got bored of all the "the prophecy said someone would do this, then he did that". Did finish it, but was never tempted by the sequels. ( Now that I think of it, never got far into Clockwork Orange, Catch-22, nor The World According to Garp. All considered (more or less) classics at the time I tried them. )
  7. https://en.wikipedia.org/wiki/Pareidolia Pareidolia
  8. They were predicted by theory, before observation was made; that's pretty strong stuff. Also, existence of a literal singularity is not considered fact. The idea of an infinitely dense infinitely small mass is mostly pop-science. All that's needed for a black hole is for its mass to be within a certain size, not necessarily a singularity. So "another fundamental force preventing the formation of a singularity" would not actually disprove or prevent black holes.
  9. Trump is the most smart American.

    Trump started by being given a large sum of money by his Father. By some estimates, his current wealth is no greater than if he had simply stuck that money in a bank account. The idea that he's a great businessman is a myth. One thing he is good at, is self promotion.
  10. Freefall acceleration: 9.8m/s/s = 9.8m/s^2

    Don't want to push a dead topic but another thing occurred to me just before the previous post and I wanted to get it off my chest, that is, to show algebraically how the .../s/s becomes ...s^s. The thing to remember is that A/B = A x 1/B So m/s/s = m/s x 1/s = (m x 1)/(s x s) = m/s^2
  11. Freefall acceleration: 9.8m/s/s = 9.8m/s^2

    Consider what the "/s/s" means. It's "per second per second". That equates to "per second squared". (A second is a measure of time, it's not (by itself) a measure of speed. (Velocity implies direction).)
  12. Freefall acceleration: 9.8m/s/s = 9.8m/s^2

    It is just math. e.g. 20/2/2 = 10/2 = 5 20/2^2 = 20/4 = 5
  13. Mass and weight (yr 11)

    Just to have a go at putting this into words: You can think of mass as a measure of the "stuff" in something. Say you make a ball of lead that you weigh as 6 pounds on your bathroom scales. There's a certain number of Pb atoms in that ball. If you take that ball - and your bathroom scales - to the Moon: with its 1/6 surface gravity compared to Earth you'll now measure it to be 1 pound. But all the Pb atoms are still in the ball. None of them vanished. The mass of the ball is what stays the same, it's the weight that varies, based on the strength of gravity where the measurement takes place. To take it to the extreme, consider dropping the ball and scales off in space. The scales might measure zero ... the ball is "weightless" - but again, all the lead atoms are still in the ball. It doesn't have zero mass. e.g. It would still take force to push the ball, to accelerate it to some speed.
  14. Cross posting is considered rude/spamming in most forums.
  15. I have difficulties understanding relativity

    It's not really about the clock. It doesn't matter if the clock is a wind-up wristwatch, a battery operated quartz crystal controlled digital watch, a sand-filled egg timer, the beating of someone's heart, or the regular drip of water out of a small hole. It doesn't matter how the clock works, as long as the clock measures time, and time is affected, the clock is affected (from the point of view of some observer moving relative to that clock, or at some other gravitational potential).