- The air outside is cool, the air inside is warm. Room has two windows. I want to put a fan on one of them to cool down the room. Is it more effective to place it pointing outwards (to suck the hot air out) or inwards (to suck the cool air in)?
- There are waves associated with the electromagnetic and now gravitational forces. Are there similar waves for the strong and weak nuclear forces?
- Is it possible to trap light in a hollow ball whose inside is made out of mirror?
- How do you measure buoyancy and compare the buoyancy of two different liquids?
- How many states of matter are there (beyond the 4 common ones and more exotic ones)?
- Why is the radius of potassium and fluoride ions close, but the radius of the potassium and fluorine atoms so different?
- Why do clouds have flat bottoms? Why do they seem to just stop?
- Is there a succinct unit name for liters per meter squared per hour?
- Do moving masses leave a wake of gravitational waves behind them?
- Can a photon move in a straight line ?
- Could a laser be made from sound as it is from light?
- Two parts: Does distance, in any way, affect relative time dilation? And, how do objects remain stable if all their parts are experiencing time at different speeds relative to each other?
- Why do certain cookies like Oreos get softer instead of stale when you leave them out?
- What do the numbers and letter "452B" signify in the recently discovered planet Kebler 452B?
- When I bashed my head as a child I cried; as an adult I get angry and swear. When did the change occur and why?
- Does turning a gyroscope against it's spin axis cause the gyroscope to slow down?
- What are the advantages of numeric integration (compared to integrating by finding the primitive function) ?
- Is is possible for the brain to become self aware?
- Will Speaker work with less mAh?
- Can animals feign injury?
- The Zika virus can be transmitted through mosquitoes, so why can't AIDS?
| Posted: 24 Feb 2016 05:49 PM PST Edit: I'm glad this has sparked so many interesting discussions. I'll add more details:
[link] [comments]  |
| Posted: 25 Feb 2016 02:05 AM PST |
| Is it possible to trap light in a hollow ball whose inside is made out of mirror? Posted: 25 Feb 2016 06:24 AM PST Say you have a ball which can be opened. Inside the ball is purely mirror. You put a flashlight that is turned on inside and you close the lid for a million years. The flashlight will have run out of battery long before then. Within the ball, will the light just keep bouncing forever? Now after a million years, someone or something opens that ball with an internal mirror. Will a flash of light occur when the ball is opened? [link] [comments]  |
| How do you measure buoyancy and compare the buoyancy of two different liquids? Posted: 24 Feb 2016 08:52 PM PST I'm helping write a guide on flotation tanks (sensory deprivation tanks) and we're comparing the relative buoyancy of the float tank solution to that of ocean salt water. We have the hydrometer readings for both of these liquids. What I'd like to know is if the following statement is true: "With pure water holding a specific gravity of exactly 1, the ocean comes in at about 1.025. Float tanks usually sit in the 1.27 - 1.3 range, making them up to 12 times more buoyant than ocean water." If not, what would be the accurate statement. Thank you for helping me with this. Archimedes principle is very confusing. [link] [comments]  |
| How many states of matter are there (beyond the 4 common ones and more exotic ones)? Posted: 24 Feb 2016 09:46 PM PST So this isn't my field of study, I'm a geneticist and bioinformatician, but I've pondered it for awhile and never found a conclusive answer. How many states of matter are there? Beyond things like solid, liquid, gas, plasma? I know things like Bose-Einstein Condensates are, but not sure where the dividing line exists. Are there weird quirks in metallic phases that would be different from a straight solid? I recall reading somewhere it was 8 or 9 but others (and the wiki I link to below) say it's more. Is there a realistic answer or is that dependent on how you define what a state/phase of matter is? As an aside I did read this wiki article: https://en.wikipedia.org/wiki/State_of_matter and some of the associated references. I didn't find a clear answer and ended up in a wiki/google rabbit-hole. [link] [comments]  |
| Posted: 24 Feb 2016 03:34 PM PST 1.33 Å Fluoride 1.38 Å Potassium ion Fluorine atom 42 pm Potassium atom 243 pm [link] [comments]  |
| Why do clouds have flat bottoms? Why do they seem to just stop? Posted: 24 Feb 2016 06:04 PM PST When I look at clouds, cumulus to be exact, I notice that at the bottom, they appear to be flat. I just want to know why that is. I assumed that it had to do with the atmosphere but Im not sure. [link] [comments]  |
| Is there a succinct unit name for liters per meter squared per hour? Posted: 24 Feb 2016 05:51 PM PST Question above. The hypothetical situation would be in relation to absorption / dispersion of fluids. Example how much one individual sweats out of a particular area of their body. [link] [comments]  |
| Do moving masses leave a wake of gravitational waves behind them? Posted: 24 Feb 2016 02:46 PM PST If you were on a planet, and that planet was the only thing of mass in the universe, could you tell if you were moving by looking for a wake of gravitational ripples behind the planet, like the wake of a ship? Maybe this would only be noticeable if the planet were moving at a significant percentage the speed of light, or if the planet were accelerating or decelerating [link] [comments]  |
| Can a photon move in a straight line ? Posted: 24 Feb 2016 11:59 AM PST |
| Could a laser be made from sound as it is from light? Posted: 24 Feb 2016 10:03 AM PST Civilizations from other times and places used sound to move heavy objects, bore tunnels and power engines, according to the Seth Materials. If this were true, could we do this in our civilization? I'm guessing that to start we'd have to control and amplify the sound energy. So, my question: Could a laser be made from sound? [link] [comments]  |
| Posted: 24 Feb 2016 09:03 AM PST As an object's speed approaches the speed of light it will advance through time more slowly, relative to myself (a stationary observer in this hypothetical). Does distance in any way impact this? For example, if I was to spin an object in a 6 inch orbit around my hand at close to the speed of light, would it experience the same time dilation as if I had sent it to Neptune and back at the same speed, presuming both examples travel for the same period of time relative to myself? Now, I know the answer will be yes, but here's the bit that stumps me. All particles/atoms/little tiny bits of stuff are vibrating and bouncing around and bumping against each other to create solids and liquids and gasses etc. presumably all at very high speeds. Why does this movement not create relativistic time dilation within every object and form of matter? Or even within plants, animals and ourselves? Why is anything ever stable if everything is always moving at different speeds relative not only to separate things around it, but also to each of its own individual parts? Am I completely missing a simple explanation or am I stumbling into quantum physics or some other concept above my education level? Or is the difference just negligible and it all works because the speeds are no where near fast enough? [link] [comments]  |
| Why do certain cookies like Oreos get softer instead of stale when you leave them out? Posted: 24 Feb 2016 05:38 PM PST Extensive home studies also show Kebler EL Fudge also share this trait. [link] [comments]  |
| What do the numbers and letter "452B" signify in the recently discovered planet Kebler 452B? Posted: 24 Feb 2016 11:18 AM PST |
| Posted: 24 Feb 2016 05:24 AM PST Bashing my head still really hurts, as do other injuries. But as a child I would burst into inconsolable tears now I stamp my feat, shout "fuck" and I'm moody for a little while. Has my perception of pain changed? [link] [comments]  |
| Does turning a gyroscope against it's spin axis cause the gyroscope to slow down? Posted: 24 Feb 2016 01:25 PM PST I have a question about some properties of conservation of angular momentum. Take this diagram for a reference of terms. I am wondering what happens when a spinning disk is forced to turn about it's input or output axis. Clearly this provides resistance, but will the disk slow down in the process? Is the energy required to spin the disk equal to the energy it would provide in resistance? [link] [comments]  |
| Posted: 24 Feb 2016 09:38 AM PST |
| Is is possible for the brain to become self aware? Posted: 24 Feb 2016 03:47 PM PST Could the brain become self aware in the sense that it knows what it is? I don't mean you being self aware in your brain, but your brain becoming aware of itself in you. [link] [comments]  |
| Will Speaker work with less mAh? Posted: 24 Feb 2016 05:56 PM PST So long story short, I am in Australia and I am from the US and I have not found a proper adapter for my iHome. If the iHome needs 7.5V and 1800mAh would it be ok to use an adapter that would give it 7.5V and 1000mAh? [link] [comments]  |
| Posted: 24 Feb 2016 12:31 PM PST Is there any evidence of animals feigning injury to gain attention/resources from humans? We have cats, now and then they will brush around our legs while we're preparing food and inevitably sometimes their paws will accidentally be stood on. Feeling guilty, we'll give them a treat as an apology for hurting them. Assuming this happened many times, could an animal become conditioned to put itself at risk of small injury from humans to gain a reward? Or more extremely, finding that they are rewarded when injured, outright feign injury in search of reward? [link] [comments]  |
| The Zika virus can be transmitted through mosquitoes, so why can't AIDS? Posted: 24 Feb 2016 05:25 PM PST |
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