If extra wings seen on biplanes add more lift and maneuverability, why don’t we add them to modern planes or jets and have them built into the airframe like we do today? |
- If extra wings seen on biplanes add more lift and maneuverability, why don’t we add them to modern planes or jets and have them built into the airframe like we do today?
- Does the moon or other planets have magnetic poles?
- Why are cooling towers shaped the way they are?
- Does body language have 'dialects' as such?
- What exactly happens when Polyurethane foam is formed?
- Do birds have tastebuds?
- Why doesnt AIDS burn itself out?
- Can current models accurately predict the temperature of super nova stars just before they explode and create a black hole?
- If my weather app breaks down the probability of precipitation by hour, how do I determine the probability for the day?
- Why can't processors guarantee calculation of a known problem in constant length of time?
- All commercial airplanes basically have the exact same design; is that by necessity or happenstance? Did it really have to be that one way?
- How do animals without parental figures know what species to mate with?
- Differing forces in different reference frames?
- Why does the Pauli Exclusion Principle apply to fermions but not to bosons?
- Can a x86_64 CPU be designed to run code meant for ARM_64?
- Could you make a Silicon version of Graphene?
- Why do some plants have colorful (not green) leaves in the spring and summer and not just in the fall?
- If there is an absolute cold, is there an absolute hot?
- Is development of muscle memory partially performed outside the brain?
| Posted: 13 Apr 2018 05:05 AM PDT |
| Does the moon or other planets have magnetic poles? Posted: 12 Apr 2018 10:51 PM PDT Would we be able to use a compass there like we do here? [link] [comments]  |
| Why are cooling towers shaped the way they are? Posted: 13 Apr 2018 04:28 AM PDT Power plants or large factorys all have the same shape of their cooling tower. The radius is smaller in the middle and widing up on top again. Whats the reason we dont use the same radius everywhere or it only gets smaller higher up. [link] [comments]  |
| Does body language have 'dialects' as such? Posted: 13 Apr 2018 05:40 AM PDT |
| What exactly happens when Polyurethane foam is formed? Posted: 13 Apr 2018 03:20 AM PDT I am currently doing my mechanical engineering dissertation on making structures using polyurethane foam, I have no background in chemistry and reading through many papers on polyurethane I find them hard to follow sometimes. I have searched through many papers to try and find what is going on but I cannot. Basically I have seen studies whereby the PU foam is formed within a vacuum, however in my experiments I have tried to form PU foam within a bag and it does not expand anything like it does when open to the air. Can anyone explain what is going on and why air is needed? Or am I missing something ? I am using 2 part pour-able foam. TL:DR Polyurethane 2 part foam is not expanding properly when not exposed to air, why? [link] [comments]  |
| Posted: 13 Apr 2018 05:32 AM PDT What draws them to French fries, potato chips, and other "snacky" foods? [link] [comments]  |
| Why doesnt AIDS burn itself out? Posted: 13 Apr 2018 06:04 AM PDT Shouldnt there be a point where AIDS kill all of the lymphocytes that are its host, therefore not being able to reproduce anymore and dying. I.e burning itself out. [link] [comments]  |
| Posted: 12 Apr 2018 10:37 PM PDT can the temperature be predicted as a star implodes, is there evidence to support how accurate the predictions of those temperatures are? [link] [comments]  |
| Posted: 13 Apr 2018 05:38 AM PDT Right now it says 40% chance for the next two hours, 50% for the next hour, 56% for the next two hours, and then 30% for the rest of the evening. If each of these is independent, does that mean the probability for the whole day is very high? Or is the whole day probably still around the 50% range? [link] [comments]  |
| Why can't processors guarantee calculation of a known problem in constant length of time? Posted: 13 Apr 2018 04:41 AM PDT |
| Posted: 12 Apr 2018 10:25 PM PDT |
| How do animals without parental figures know what species to mate with? Posted: 12 Apr 2018 01:19 PM PDT |
| Differing forces in different reference frames? Posted: 13 Apr 2018 05:06 AM PDT Posted the question in the r/Physics thread but haven't gotten any answers so figured I might try my luck here. A question that has been confusing me for a while now:- Firstly, we consider the day-to-day frame of reference that we normally think about. We are pulled down by a gravitational force mg downwards, and pushed up by the normal force of same magnitude provided by the ground - hence we stay stationary on the ground with no acceleration. However, if we look at the entire Earth as a reference frame, the Earth is rotating on its axis and we are rotating on it with the same angular velocity. Then clearly we cannot have the normal force N=mg, since in that case we would have no net acceleration and will not rotate in a circle around the Earth's axis. So this is the part where I get confused about what forces are in play here. I think the normal force by the Earth in that reference frame must not be opposite to the gravitational force, but rather their vector sum should point towards the Earth's rotational axis to provide us with the centripetal acceleration. However in that case, why does the same(?) normal force appear to be acting in different directions in different reference frames? I also might be wrong in my analyses of forces present and there is another (pseudo?)force that can help explain this problem. [link] [comments]  |
| Why does the Pauli Exclusion Principle apply to fermions but not to bosons? Posted: 12 Apr 2018 12:53 PM PDT |
| Can a x86_64 CPU be designed to run code meant for ARM_64? Posted: 13 Apr 2018 12:43 AM PDT Unless I got something wrong a x86_64 should be able to handle all the instructions that an ARM_64 can, just at reduced speeds. [link] [comments]  |
| Could you make a Silicon version of Graphene? Posted: 12 Apr 2018 01:43 PM PDT Would it be possible to have a silicon (or other element in that group/column) equivalent of graphene where the atoms are arranged in the same manner? I imagine this substance would have similar properties to the carbon version. [link] [comments]  |
| Posted: 12 Apr 2018 11:33 AM PDT |
| If there is an absolute cold, is there an absolute hot? Posted: 12 Apr 2018 04:43 PM PDT |
| Is development of muscle memory partially performed outside the brain? Posted: 12 Apr 2018 09:01 AM PDT I'm aware that many changes occur in the brain when developing muscle memory, but I do not know to what degree the part of the somatic nervous system outside the brain changes and whether or not those changes are largely significant to performing a particular motor function. If you were to learn to play the guitar but, after doing so, only retained the neural development done directly in your brain, would you still have the capacity to play? I understand this is a hypothetical question to a degree, but the information the answer provides is relevant to the more concrete question underneath. [link] [comments]  |
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