If an electric motor is supplied power but restricted in turning (like holding back a ceiling fan) what is happening which would cause it to 'burn up'? |
- If an electric motor is supplied power but restricted in turning (like holding back a ceiling fan) what is happening which would cause it to 'burn up'?
- If a redwood or pine tree were to live in the perfect conditions, with enough nutrients and without pests or disease or deforestation. Could the tree live forever?
- Why is greenhouse gas one way?
- Why do things seem to start spinning the other way after reaching a certain speed?
- If, instead of electromagnetic force, Magneto had control over the weak nuclear force, what would be the things he could do?
- 130000 year old mastadon in California. There aren't signs of meat removal on the bones. How do they know WHEN the tools were used to process the bones?
- What sort of negative consequences could result from a desert ecosystem suddenly receiving an exorbitantly large increase in rainfall?
- How do fins stabilize a rocket (or any other projectile)?
- Why are severe allergic reactions to peanuts and other nuts so common compared to other foods and potential allergens?
- Why do we take consider a zero point at r = infinity for Gravitational Potential Energy?
- Why are Magnetars extremely magnetic?
- Are men more likely to part with resources in the presence of attractive women?
- Why does a ray of beta particles curve more than a ray of alpha particles in an electric field?
- Why does boundary flow stay attached to an airfoil?
- Why do second and third gen stars contain heavier elements that the first gen stars?
- Could you be struck by lightning inside a storm cloud?
- Why is it that early human remains are so rare to find in the Americas?
| Posted: 26 Apr 2017 10:31 PM PDT |
| Posted: 26 Apr 2017 09:41 PM PDT |
| Why is greenhouse gas one way? Posted: 26 Apr 2017 07:48 PM PDT So green house gas like CO2 supposedly keeps heat inside the atmosphere, but if it doesn't let heat back outside the atmosphere, why can heat get inside in the first place? [link] [comments]  |
| Why do things seem to start spinning the other way after reaching a certain speed? Posted: 26 Apr 2017 07:45 PM PDT |
| Posted: 26 Apr 2017 02:30 PM PDT assuming he can control as well as he does magnetism(even though probably it does not correlate a 1 to 1 mach) [link] [comments]  |
| Posted: 26 Apr 2017 07:59 PM PDT How feasible is it that 13000 years ago like current science believes whatever evolution of humans found the bones and processed them for the bone 117000 years ago? The tools can't be dated, right? They are stone and could have been in the area; there's reasonable doubt unless we can tell when a rock was broken to form it with dating and I am unaware? The lack of meat removal from the bones suggests the meat was unusable for whatever reason. Or am I just waaay left field? [link] [comments]  |
| Posted: 26 Apr 2017 07:31 PM PDT |
| How do fins stabilize a rocket (or any other projectile)? Posted: 26 Apr 2017 07:07 PM PDT |
| Posted: 26 Apr 2017 03:04 PM PDT |
| Why do we take consider a zero point at r = infinity for Gravitational Potential Energy? Posted: 26 Apr 2017 06:07 PM PDT I have two questions, a main one (title) and a side question I added. 1) The first one has to do with the formula for deriving Gravitational Potential Energy. I learned that, for the derivation of Gravitational Potential Energy given large distances, we have to use the mathematical analytic way to derive an expression for it at a given distance. To do so, you need integrate F dot dr from r to infinity. However, what I don't understand are as follows:
If I was trying to figure out how much energy I need to give an object to raise it from one point in space to another relative to, say the Earth, I could take the change in energy from the two points. If its energy at its initial point is 2 and the energy at the point I want it to be at is 8, I need to supply 6 joules to it. But how do I reconcile that with the derivation from the above paragraph? 2) The second question has to do with zero points for potential energy. Is this allowed because, as long as the distance from each object relative to another is the same no matter where I place a zero point, everything resolves? If at point A, object 1 is 2 units from point A and object 2 is 5 units from point A (all in, say, the x axis), then I'm not cheating by taking point B to be at object 1's position and saying object 2 is now 3 units from point B, right? Wouldn't its potential energy then change here though? That's okay because it's all relative, right? But the magnitude changes.. that's okay? [link] [comments]  |
| Why are Magnetars extremely magnetic? Posted: 26 Apr 2017 12:35 PM PDT From my knowledge of magnetism, extreme heat would remove magnetic properties from substances by messing with the spin of electrons in orbit. So why are magnetars, which reach such extreme levels of heat, still so powerfully magnetic. [link] [comments]  |
| Are men more likely to part with resources in the presence of attractive women? Posted: 26 Apr 2017 01:27 PM PDT I recall reading studies of this nature and I'm currently writing a piece on related issues. Any help appreciated. [link] [comments]  |
| Why does a ray of beta particles curve more than a ray of alpha particles in an electric field? Posted: 26 Apr 2017 01:51 PM PDT So I know the an alpha particle consists of 2 protons and 2 neutrons and that a beta particle consists of just one electron How is it that a ray of beta particles will curve more in an electric field than a ray of alpha particles? [link] [comments]  |
| Why does boundary flow stay attached to an airfoil? Posted: 26 Apr 2017 12:31 PM PDT I'm a pilot studying to be a flight instructor, and I'm really trying to brush up on my aerodynamics. I have a background in the natural sciences, but never took physics, so a lot of it is kind of "learn as I go." From what I've come to understand, the Coanda effect really doesn't apply because we're not dealing with a fluid jet. The explanation I've heard is that the curvature of an airfoil creates a centripetal acceleration, which creates a pressure gradient where lower pressure exists closer to the airfoil. But there's some relationship I'm missing, because to me that seems dependent on a tendency to stay attached to the surface. As I understand it, in order for there to be centripetal force acting on the fluid, some additional force must be acting on it to keep the boundary flow attached. Otherwise, when the air diverts over the top of the wing, it would just continue unaccelerated past the upper camber of the airfoil. So what keeps the boundary flow "attached" to the airfoil? Is it something as simple as friction? Any help to understand all of the various forces affecting curved boundary flows would be much appreciated! [link] [comments]  |
| Why do second and third gen stars contain heavier elements that the first gen stars? Posted: 26 Apr 2017 05:02 PM PDT |
| Could you be struck by lightning inside a storm cloud? Posted: 26 Apr 2017 04:58 PM PDT If I were somehow able to suspend myself inside a storm cloud, or stood on top of a blimp or some type or airship, would I be struck by lightning? Or would the lightning ignore me and go for the tallest object attached to the ground? [link] [comments]  |
| Why is it that early human remains are so rare to find in the Americas? Posted: 26 Apr 2017 06:21 PM PDT I just read through an article detailing the find of a mastodon skeleton that seems to show evidence of early human tool-making and use from ~130,000 years ago. In the article they mention that early human remains are notoriously difficult to find. Why is that? Edit: original thread [link] [comments]  |
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