Can you really trigger an avalanche by screaming really loud while in snowy mountains? |
- Can you really trigger an avalanche by screaming really loud while in snowy mountains?
- Where does the power come from that is needed to levitate a superconducting magnet against the constant pull of gravity?
- How do astronauts keep their helmets from fogging up?
- Are all devices that communicate with electromagnetic waves using either amplitude modulation or frequency modulation?
- How do we actually know the half life of elements with an extremely long half life?
- What's the best way to avoid a tie in this lottery game?
- Why won't a p-n diode conduct when reverse biased?
- How did we realize that there was no air in the universe?
- Can a person lose fat cells or do they just change in size?
- Definite integrals vs Antiderivatives/Indefinite Integrals?
- What determines how long creatures live?
- Why isn’t the inside of an eye illuminated by the light that enters it?
- Why does systolic blood pressure increase more than diastolic blood pressure when exercising?
- Do people with low caloric intake and high physical activity eventually burn the fat stored on their breasts and/or butt to the point that they'll get "flat"?
- How do succulent plants spread naturally?
- Is there really a immense intelligence gap between humans and apes?
- Why do house animals such as cats and dogs have much more diverse sets of coating than their wild counter parts?
| Can you really trigger an avalanche by screaming really loud while in snowy mountains? Posted: 17 Jan 2020 07:57 PM PST Like,if you can does the scream have to be loud enough,like an apporiate value in decibels? [link] [comments]  |
| Posted: 18 Jan 2020 05:44 AM PST In an aircraft in steady flight, lift exactly matches the pull of gravity. Generating that lift requires a continuous flow of power which is fed by the consumption of fuel. But a levitating supermagnet just sits there mid-air as long as it is kept cold enough. How? (Yes, I know that a lot of a plane or helicopter's power is also used to overcome drag, thrown away as waste heat, accelerate, or to do other useful things. Let's set that aside for now.) [link] [comments]  |
| How do astronauts keep their helmets from fogging up? Posted: 17 Jan 2020 09:44 PM PST I remember my dad asking that when Apollo 11 came out when I was a kid, and now I still don't have a definite answer. [link] [comments]  |
| Posted: 18 Jan 2020 12:42 AM PST Or is there another way that EM radiation/waves can somehow hold data? [link] [comments]  |
| How do we actually know the half life of elements with an extremely long half life? Posted: 17 Jan 2020 04:39 PM PST My rudimentary understanding is that half life can be determined by determining the mass of an object at a given time and measuring its change in mass to determine decay. How does this work with things that have half lives of millions or billions of years? Certainly the rate of decay would be so minimal it couldn't be practically measured and extrapolated with accuracy? [link] [comments]  |
| What's the best way to avoid a tie in this lottery game? Posted: 18 Jan 2020 01:20 AM PST We want to host a lottery game as part of an event. They way it was done before was to ask everyone there to choose 12 numbers between 1 and 50, and then to start randomly selecting numbers between 1 and 50. Anyone who hears one of their numbers said has to sit down, and the winner is the one person left. We did this with about 50 people and it worked fine, but we're now going to do with a larger group (over 100), and are worried it is more likely to be a tie. Would increasing the range or the number of choices improve the probability that there's just one winner? [link] [comments]  |
| Why won't a p-n diode conduct when reverse biased? Posted: 17 Jan 2020 05:22 PM PST I think I understand pretty well how a p-n diode works when forward biased: The p-side of the depletion zone contains negatively charged ions, and the n-side of the depletion zone contains positively charged ions. These ions create an electric field within the depletion zone that opposes current flow. As the voltage across the diode approaches its forward threshold voltage, the depletion zone gets smaller, and therefore the strength of its electric field gets weaker. The point when the applied voltage surpasses the strength of the electric field in the depletion zone is the forward threshold voltage, and this is when current begins to conduct. If any of that is wrong, let me know. But I don't understand why current won't conduct when the diode is reverse biased. I understand that the applied voltage pulls the free electrons in the n-side and the holes in the p-side away from the p-n junction. I also understand that this makes the depletion zone bigger. But I don't understand why current cannot flow through the depletion zone in this case. If in the forward biased mode the electric field in the depletion zone opposes current flow, then in the reverse biased mode, when current would be flowing in the opposite direction, wouldn't the electric field in the depletion zone instead bolster it? Or does the polarity of the electric field in the depletion zone change when you switch from forward biased mode to reverse biased mode? If so, why does its polarity change? Or is something else going on here that is preventing current flow? Please help. [link] [comments]  |
| How did we realize that there was no air in the universe? Posted: 17 Jan 2020 11:52 AM PST |
| Can a person lose fat cells or do they just change in size? Posted: 17 Jan 2020 06:51 AM PST When a person loses weight does their fat cell count decrease or does the size of the cells decrease? [link] [comments]  |
| Definite integrals vs Antiderivatives/Indefinite Integrals? Posted: 17 Jan 2020 09:06 AM PST What is the difference between the two? Also are antiderivatives and indefinite integrals the same thing? [link] [comments]  |
| What determines how long creatures live? Posted: 17 Jan 2020 06:32 PM PST For instance, why do blue whales live hundreds of years, but dogs only live 8-20 years? [link] [comments]  |
| Why isn’t the inside of an eye illuminated by the light that enters it? Posted: 17 Jan 2020 05:51 AM PST |
| Why does systolic blood pressure increase more than diastolic blood pressure when exercising? Posted: 17 Jan 2020 04:47 AM PST |
| Posted: 17 Jan 2020 12:56 AM PST |
| How do succulent plants spread naturally? Posted: 16 Jan 2020 11:29 PM PST To my understanding, the majority of succulent plants can propogate only through planting clippings, and naturally don't have seeds. In a wild setting, how are succulents meant to propogate? What natural occurrence starts with the leaf of a succulent plant in the middle of a desert and ends with leaf clippings in the ground? [link] [comments]  |
| Is there really a immense intelligence gap between humans and apes? Posted: 16 Jan 2020 09:01 PM PST I know people will say that humans are by far more intelligent that other animals as we possess and know an unquantifiable amount. However, most of the things we know are built up and learned from earlier generations. Even if we were a reasonably more intelligent than primates, this build up over thousands generations would have a tremendous impact. There are also many studies claiming that chimps have better short term memories than humans. My question is, if a baby chimp and human grew up in the same environment, with no parents (and therefore no education) would the human really know much more after 20 years? (They would definitely know more, but would there be a huge differentiating factor? After all, cavemen weren't that well off). Is there really a huge gap in intelligence between apes and man? [link] [comments]  |
| Posted: 16 Jan 2020 07:57 PM PST |
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