How can a maglev train be energy efficient? |
- How can a maglev train be energy efficient?
- Why do some solvents separate from water when the solution freezes?
- Why is it easier to feel the air blowing out of a fan than the air the fan is sucking in?
- Is it possible to powerset a set infinitely many times?
- Can permanent magnets be explained through classical electromagnetism?
- How effective is CPR for the immediate treatment of cardiac arrest?
- Why did the black death just stop?
- Do bioluminescent creatures only produce light in the visible spectrum?
- Is Calculus an on-going research area ?
- How do superconductors work? What changes when they are super cooled?
- How does a satellite know its location in space, so as to adjust its thrust/trajectory to avoid collision with objects and find a stable orbit?
- Can mass be relative?
- How far out could we maintain a geosynchronous orbit?
- Does being upside down have any negative effects on the brain due to the blood rushing to your head?
- Does our method of finding planets vastly restrict the amount of planets we discover?
- Can it rain sand?
- What are the "remnants" of Halley's Comet?
- Were there ever any aquatic dinosaurs?
- Did the Dust Bowl improve agricultural production in areas where top soil was deposited by winds?
- Is air resistance at 80 mph the same as wind up to 80 mph?
- When an airliner flies by, there is a white cloud emitted just behind the plane. What is this composed of, and why does it only happen sometimes?
- What physical properties make an object sharp?
| How can a maglev train be energy efficient? Posted: 03 May 2016 06:20 AM PDT According to Wikipedia, the energy used to keep the train stable above the rails is small compared to the energy used to counteract drag. With an object as heavy as a train, how is this possible? [link] [comments]  |
| Why do some solvents separate from water when the solution freezes? Posted: 03 May 2016 02:52 AM PDT Like a bottle of lemonade made from mix for example. When it partially freezes there is a chunk of mostly just water ice, and a small amount of very concentrated solution. What is the process by which this happens? [link] [comments]  |
| Why is it easier to feel the air blowing out of a fan than the air the fan is sucking in? Posted: 02 May 2016 04:27 PM PDT |
| Is it possible to powerset a set infinitely many times? Posted: 02 May 2016 10:54 PM PDT and if so does that mean i have found a set so big that if i powerset it again it will still be the same set? because powersetting a set that have been powersetted infinitely many times one more time will not make it any bigger (because infinity+1=infinity duh!) [link] [comments]  |
| Can permanent magnets be explained through classical electromagnetism? Posted: 02 May 2016 07:34 PM PDT |
| How effective is CPR for the immediate treatment of cardiac arrest? Posted: 02 May 2016 05:50 PM PDT |
| Why did the black death just stop? Posted: 02 May 2016 01:14 PM PDT I know there are still a handful of cases that happen each year, but for the most part the plague just seemed to disappear. Why hasn't this also happened with other diseases like the common cold? [link] [comments]  |
| Do bioluminescent creatures only produce light in the visible spectrum? Posted: 02 May 2016 10:16 AM PDT |
| Is Calculus an on-going research area ? Posted: 02 May 2016 10:31 AM PDT Hi redditors ! I think the question speaks for itself but I'll try to be more concise, when I say 'calculus' I mean 'pure calculus', I know calculus is useful in plenty areas of maths but I was wondering if research is still going on about it. [link] [comments]  |
| How do superconductors work? What changes when they are super cooled? Posted: 02 May 2016 06:05 PM PDT What is the direct cause of them becoming electromagnets when they are cooled to really low temperatures? [link] [comments]  |
| Posted: 02 May 2016 04:28 PM PDT |
| Posted: 02 May 2016 04:22 PM PDT Since velocity is relative based on frame of reference, Kinetic Energy is relative. Energy and mass can be exchangeable so does that mean that an object can have relative mass? [link] [comments]  |
| How far out could we maintain a geosynchronous orbit? Posted: 02 May 2016 03:22 PM PDT Would it be possible to have a satellite maintain a geosynchronous orbit beyond our moon? I was thinking of this today in regards to having another lense that could magnify our current telescopes beyond what we have. Whether that be an earth based or space based like Hubble or in the near future Web. [link] [comments]  |
| Does being upside down have any negative effects on the brain due to the blood rushing to your head? Posted: 02 May 2016 04:04 PM PDT I've had this question for a while, it's extremely common for someone in gymnastics or gymnastics-like programs to do things like handstands or any other exercise that requires the body to be upside down for anywhere up to a few minutes at a time. While I'm pretty sure it's completely fine to do this every now and then, would doing this at a high frequency, say every day for months or even years have any negative impacts on the brain due to the large amount of blood rushing to your head? [link] [comments]  |
| Does our method of finding planets vastly restrict the amount of planets we discover? Posted: 02 May 2016 04:05 PM PDT I think somewhere in the nebula origin hypothesis for Solar Systems, planets tend to all "flatten out" onto the same plane orbiting a star. I've read that many planets are discovered in other solar systems by watching the newfound planet traverse the star and blocking a small fraction of the light emitted. Wouldn't this method of finding new planets miss any planet that doesn't directly cross the star? From Earth's perspective, wouldn't this only reveal a tiny fraction of planets nearby? I know other planets can be found based on gravity, but isn't the star method the primary method, or am I missing something? Interested to hear what you guys think! [link] [comments]  |
| Posted: 02 May 2016 03:38 PM PDT I live a few miles from the coast and sand is on everything. I know the winds are responsible for most of it but I was wondering if any of it comes down with raindrops from being evaporated out of the ocean. [link] [comments]  |
| What are the "remnants" of Halley's Comet? Posted: 02 May 2016 05:52 PM PDT I read this article and it stated that two meteor showers, the Eta Aquarids and the Orionids both give us a chance to view the remnants of Halley's Comet. What does this mean, that Halley's Comet destroyed a bunch on space stuff that was in its trajectory and this is debris or that Halley's Comet was struck and is broken up/breaking down and the Comet's pieces are falling toward Earth creating the shower? [link] [comments]  |
| Were there ever any aquatic dinosaurs? Posted: 03 May 2016 05:04 AM PDT I'm aware there were prehistoric swimming reptiles (plesiosaurs, mosasaurs, ichthyosaurs, etc.), but as I understand they belonged to class: reptilia, so they weren't dinosaurs proper. It seems like the major classes of modern animals--reptiles, birds, and mammals--have all at some point gone back to the sea (e.g., sea turtles, penguins, wales). Are there any examples of aquatic animals belonging to class: dinosauria? In other words, are there any examples of aquatic dinosaurs that clearly evolved from a terrestrial dinosaur ancestor? Sorry if this is a naive or out-of-date question. I'm not familiar with dinosaur phylogeny. [link] [comments]  |
| Did the Dust Bowl improve agricultural production in areas where top soil was deposited by winds? Posted: 02 May 2016 01:14 PM PDT |
| Is air resistance at 80 mph the same as wind up to 80 mph? Posted: 02 May 2016 03:45 PM PDT I was in the car with a friend going about 80 mph, and he stuck his arm out the window. Would his body be subject to the same forces if he were just sticking his arm out a house window and winds were blowing 80 mph? If not, why are they different? [link] [comments]  |
| Posted: 02 May 2016 12:39 PM PDT |
| What physical properties make an object sharp? Posted: 02 May 2016 09:27 AM PDT |
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