- Do sound canceling headphones function as hearing protection in extremely loud environments, such as near jet engines? If not, does the ambient noise 'stack' with the sound cancellation wave and cause more ear damage?
- Does understanding the Placebo Effect have an impact on its efficacy?
- Are extra spatial dimensions something we can accurately perceive with a trained mind?
- Why do bags form under your eyes when tired?
- What will be the speed of water waves in water, after a stone (or any body) fell into them?
- Would we see the universe age slower/faster if our galaxy didn't move through space?
- May be a dumb question, but why do some things (like bouncy balls) bounce, while others (like watermelons) explode on impact?
- When two light waves experience destructive interference what happens to the energy? How does the conservation of energy apply here?
- Do all cells in an organism have the same DNA?
- How fast can a bubble float up?
- Would a moon with an ocean have tidal waves generated by its planet? How big would they be?
- Photons have momentum. Do they have direction?
- Do gravitational pull decrease over distance?
- When the area of a cross section of a pipe decreases, the pressure of the air flowing through it increases or decreases?
- What kind of infection determines if we get a fever?
- Is it possible that areas of Mars previously theorized to be formed by basaltic lava flows are in fact formed by water ice?
- How do we distinguish between redshift due to expansion and redshift due to time passed?
- Why are synthetic cannabinoids so much more toxic than cannabinoids found in cannabis?
- What happens when you pop a balloon in middle of the space?
- How do plant's filter out CO2 from the air?
- If you are drunk and a mosquito bites you and you allow it to drink it's fill, will the mosquito become intoxicated?
- Physics: How would daily communication be received on earth when sent from near light speed spacecraft traveling towards another star system?
| Posted: 24 Dec 2015 08:44 AM PST |
| Does understanding the Placebo Effect have an impact on its efficacy? Posted: 24 Dec 2015 09:07 AM PST |
| Are extra spatial dimensions something we can accurately perceive with a trained mind? Posted: 24 Dec 2015 10:59 PM PST On that note, it seems the only way to begin to perceive these dimensions is by seeing wireframe shapes in constant rotation. I feel that there is a way to perceive these in our mind with extra mental senses, maybe artificial senses of time/space and seemingly impossibly connected points in space (like how worm holes are theorized in sci Fi movies) that we could conjure in our imaginations with enough focus and mental exercises. Is that how you high level physicists are trained to understand quantum physics and string theory? [link] [4 comments]  |
| Why do bags form under your eyes when tired? Posted: 24 Dec 2015 04:41 PM PST |
| What will be the speed of water waves in water, after a stone (or any body) fell into them? Posted: 24 Dec 2015 06:30 AM PST |
| Would we see the universe age slower/faster if our galaxy didn't move through space? Posted: 24 Dec 2015 05:36 AM PST Been wondering about this ever since I learned about Time Dilation. I read that our galaxy moves through space at +- 600 km/s. Does that have any influence on how we see the universe progress? [link] [25 comments]  |
| Posted: 24 Dec 2015 02:30 PM PST Was just thinking about this, and realized I don't actually know the answer. I mean, if I were asked, I'd probably guess something like a watermelon is more brittle, but at the same time I also feel like if you filled one of those huge hollow rubber balls with liquid, it would probably explode too, so there must be more to it than just that, right? I'm also not super science-literate, so ELI15-ish where possible? And thanks in advance! [link] [2 comments]  |
| Posted: 24 Dec 2015 11:30 AM PST |
| Do all cells in an organism have the same DNA? Posted: 24 Dec 2015 03:58 PM PST |
| How fast can a bubble float up? Posted: 24 Dec 2015 12:08 PM PST In water, what's the fastest that an air bubble can float upward? [link] [1 comment]  |
| Would a moon with an ocean have tidal waves generated by its planet? How big would they be? Posted: 24 Dec 2015 11:43 AM PST |
| Photons have momentum. Do they have direction? Posted: 24 Dec 2015 07:34 PM PST |
| Do gravitational pull decrease over distance? Posted: 24 Dec 2015 03:59 PM PST If so: - Is it the distance from the center of gravity or the edge of the object? - Why are there a different gravitational pull on different places on the surface of Earth? [link] [9 comments]  |
| Posted: 24 Dec 2015 09:45 PM PST According to Bernoulli's theorem, as area of cross section decreases, velocity increases (by continuity eqn.) and pressure decreases (law of conservation of energy - as pressure energy is converted to kinetic energy) But by P=F/A, let's say when the output of a compressor is connected to a tube of cross section X (A-A') the pressure is P1 and in the same line if I decrease the area of cross section to Y at (B-B') the pressure is P2. Now P2 is greater than P1 right? why is that so? I understand there is someother variable at play. Is it Q ?(flow rate) Also is there relation between Pressure and flow rate? [link] [4 comments]  |
| What kind of infection determines if we get a fever? Posted: 24 Dec 2015 11:25 AM PST So obviously a fever is our body fighting off an infection. But what determines whether we get a cold or a fever? Both are reactions to an infection. [link] [4 comments]  |
| Posted: 24 Dec 2015 08:59 AM PST In light of current discoveries of ice buried under the oxidized surface regolith on Mars, such as glaciers in northern and southern latitudes along with a frozen sea to the north in the Arcadia Planitia region, I'd like to know if areas such as the Sacra Fossae region linked below are still thought to be formed by catastrophic flooding from water followed by being filled with lava. How did we determine that this is composed of lava rather than ice that's been covered by dust and dirt over millennia? I know orbiters have a hugely difficult time confirming ice under surface regolith (either MRO's Shallow Radar "SHARAD" or a neutron spectrometer aboard NASA's 2001 Mars Odyssey spacecraft is required to confirm subsurface ice, and even then, only close to the surface) so I can understand how assumptions could be made about the geological composition of these areas that isn't necessarily accurate. The uniform elevation and perimeter erosion of the low lying areas where outwash once flowed from the Echus Chasma region of Mars north to the Sacra Fossae region appear to be a result of aqueous processes followed by freezing. In any given Mars image it's easy to assume that something could be basaltic lava flow, but when using say Google Mars where all the data/images are connected together, the context allows for a much better understanding of the erosional processes that have affected an area and the topography that stretches for thousands of kilometers. If there is basaltic lava involved here, its source is not at all apparent unless it just rose up through ground fissures to conveniently fill the same areas that were previously eroded by aqueous processes. Aerial imagery of lava fields on earth do not resemble these low lying Martian areas either, however ice flows off the Antarctic coast show surface features that share a striking resemblance (only white instead of orange) to what's being seen in the Martian images. Below are two links to images from the Sacra Fossae and Mangala Fossae regions for context. Referencing the topography from the images below against areas of frozen ice sheets off the Antarctic coast makes for a pretty compelling case for water ice. http://www.dlr.de/media/en/Portaldata/8/Resources/portal_news/2009_2/kasei_co.jpg http://www.esa.int/spaceinimages/Images/2008/09/Mangala_Fossae [link] [comment]  |
| How do we distinguish between redshift due to expansion and redshift due to time passed? Posted: 24 Dec 2015 04:51 PM PST From my understanding the evidence for hubble's law is the stronger redshift of objects that are further away from us. Assuming uniform deceleration of all objects or expansion wouldn't we expect to see the same thing because of the time it takes light from the further away objects to reach us? [link] [2 comments]  |
| Why are synthetic cannabinoids so much more toxic than cannabinoids found in cannabis? Posted: 24 Dec 2015 11:39 AM PST |
| What happens when you pop a balloon in middle of the space? Posted: 24 Dec 2015 02:24 PM PST |
| How do plant's filter out CO2 from the air? Posted: 24 Dec 2015 04:25 PM PST How do plants and other organisms filter out CO2 from the atmosphere? Is there any way we can apply this artificially to other molecule's? [link] [7 comments]  |
| Posted: 24 Dec 2015 02:08 PM PST I'm assuming you at pretty drunk here, with a BAC well over the US legal limit. Would the alcohol content of your blood not have a strong effect on such a tiny insect? If so, would it just get "drunk"? [link] [1 comment]  |
| Posted: 24 Dec 2015 04:04 PM PST Imagine that mankind builds an interstellar spacecraft with a planned destination of a star system approximately 100 light years from earth. During the lengthy voyage a daily log is broadcast back to earth, at noon ship time each day. When the ship is very close to earth, the messages are received nearly instantaneously, but if the ship is accelerating away from earth at 1 g, eventually reaching 95% of c, would the time intervals between message receipts begin to grow, even though the messages are being sent at exactly the same ship time every day? What would that time lapse look like, and how would the intervals between received messages grow? Would we still receive a message every day? Wrapping my head around the idea of near-light speed time dilation is difficult without understanding the math, so a simplified explanation is needed. [link] [1 comment]  |
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