The recent fire in London was traced to an electrical fault in a fridge freezer. How can you trace with such accuracy what was the single appliance that caused it? |
- The recent fire in London was traced to an electrical fault in a fridge freezer. How can you trace with such accuracy what was the single appliance that caused it?
- In Earth travel, we use North, South, East, and West, plus altitude for three-dimensional travel. Since those are all relative to the Earth, what do they use for space travel?
- Why are humans so diverse and unique in appearance to the point where none of us look the same compared to other animal species where all individuals look the same?
- What do blind people see when they dream? Assuming they were blind from birth.
- Is the calculation of the atoms in the observable universe being 10 to the eightieth power accurate?
- Why do astronomers think a collision caused Uranus' extreme tilt yet it's moons are also tilted?
- Can the spontaneous fission of Uranium 238 emit neutrons capable to fission Uranium 235 in the same solid matrix?
- Is it possible for a planet to have at least two moons orbiting it in opposite directions? If yes, what would be the effects if it somehow happened to Earth?
- At what point in time do we stop seeing wolf fossils near humans and start seeing "dog" fossils associated with humans?
- How do cars with adaptive cruise controls deal with the 'noise' of other vehicles on the same road potentially using similar or identical radar or lidar based systems?
- How do scientists determine which two elements to use when synthesizing new elements?
- Will copper hot pipes or an iron boiler rust first?
- How do fast-acting anti-anxiety pills like Xanax work compared to drugs like buspirone, which work to change your neurochemistry more permanently over time?
- How does the primary coil impedance change due to the eddy current?
- What does wind look like on an atomic level?
- What makes AC current better suited than DC current for certain applications, and vice-versa?
- Are there events that are in the future in every frame of reference?
- Why are Birds sub-grouped under Reptiles and not in their own unique standalone class like Amphibians?
- Why did some social mammals evolve into patriarchal groups and others into matriarchal groups?
| Posted: 23 Jun 2017 05:16 AM PDT |
| Posted: 22 Jun 2017 06:56 AM PDT |
| Posted: 23 Jun 2017 06:35 AM PDT People can vary so much in looks regarding eye/hair/skin colour, height, bone structure, build, to the point where everyone who has ever existed has a unique "look". Some animals are like that too to a certain degree, like cats and dogs. For many other species of animals though all the individuals in a population look the same, like idk elephants, crows, sharks...how come they have little or no diversity in appearance? [link] [comments]  |
| What do blind people see when they dream? Assuming they were blind from birth. Posted: 23 Jun 2017 06:28 AM PDT |
| Is the calculation of the atoms in the observable universe being 10 to the eightieth power accurate? Posted: 23 Jun 2017 01:40 AM PDT |
| Why do astronomers think a collision caused Uranus' extreme tilt yet it's moons are also tilted? Posted: 22 Jun 2017 04:05 PM PDT Tilted, as in spinning in the same axis relative to our Sun. Yet it's moons have the same axis as Uranus, so collisions did all that? Sounds unlikely. [link] [comments]  |
| Posted: 23 Jun 2017 06:37 AM PDT |
| Posted: 22 Jun 2017 11:59 PM PDT |
| Posted: 23 Jun 2017 07:32 AM PDT Did dogs also go through intermediaries to transition between wolf and dog? Ie, we have H. erectus before H. sapien. Or are modern dog and modern wolves too similar ro be classified differently? [link] [comments]  |
| Posted: 22 Jun 2017 06:59 PM PDT I was thinking of a scenario where two vehicles in adjacent lanes (which could potentially be of the exact same make) are both using adaptive cruise control to maintain a fixed distance from the vehicle in front. There must be systems that allow each vehicle to differentiate the radar reflections of the proceeding vehicle in their lane and not be confused by the adjacent vehicle. I'm curious as to what those systems are specifically. [link] [comments]  |
| How do scientists determine which two elements to use when synthesizing new elements? Posted: 22 Jun 2017 09:52 PM PDT For example, Oganesson was synthesized using Californium and Calcium (98+20=118). However, another lab using Krypton and Lead (36+82=118) tried and failed to produce Ognesson. My question is, why were those specific elements chosen? I know their atomic numbers have to add to 118, but why not use Iron and Uranium? (92+26=118) Two Praseodymiums? (59+59=118) And why did Krypton and Lead fail, even though their numbers add up? Thanks in advance. [link] [comments]  |
| Will copper hot pipes or an iron boiler rust first? Posted: 23 Jun 2017 02:44 AM PDT |
| Posted: 22 Jun 2017 07:26 PM PDT I'm mostly looking for the neurochemistry aspects of it. Like, why do some drugs only perform for a short amount of time while others you have to take continually and they gradually suppress symptoms? [link] [comments]  |
| How does the primary coil impedance change due to the eddy current? Posted: 23 Jun 2017 03:50 AM PDT This question is based on one of the common methods of Non-Destructive Testing ( NDT ), called Eddy Current Testing. In this method, they use a primary coil with an AC voltage supply to it. This AC current produces a changing magnetic field in the primary coil ( Call it excitation field ). When the primary coil is brought near the component to be tested, the changing excitation field induces circular eddy currents in the surface of the component. This eddy current in turn produces a magnetic field in such a way as to oppose the changing excitation flux. The reduction in the resultant field strength will change the coil impedance. But how? Isn't the primary coil impedance only dependent on R ( resistance ), L ( inductance ) and w ( angular frequency of the AC voltage source ) ? [link] [comments]  |
| What does wind look like on an atomic level? Posted: 22 Jun 2017 02:24 PM PDT |
| What makes AC current better suited than DC current for certain applications, and vice-versa? Posted: 22 Jun 2017 01:28 PM PDT I work as an electrical assembler and have been wondering this for a while now. Why is it that high-power applications like servos and VFDs seem to be exclusively 240V+ AC, while small things like sensors seem to be exclusively 24V DC? [link] [comments]  |
| Are there events that are in the future in every frame of reference? Posted: 23 Jun 2017 03:04 AM PDT The relativity of simultaneity shows that there's no "present": there's a causal past, a causal future, here-now, and "elsewhere", as this animation handily depicts. It depicts that the faster a frame of reference moves relative to another, things that are in the causal future become the present (or past) of things in another frame's here-now. This obviously leads to the worrying conclusion that everything in the future has already happened in another frame of reference. Is that so? Is this true mathematically, in general relativity? Is this true observationally, that there are objects moving at such high speeds relative to another object, that one object's entire causal future is "visible" from another object's here-now? I assume events that are farther in the future than the diameter of the universe cannot be observed from within the universe, but is that so? Is there any group of events that is in the future in every frame of reference? What are some "canonical" books/papers that deal with the subject on a physics undergrad-postgrad level? edit
If so, then any event in the future could be said to have already happened. If not, what is the group of events that are not simultaneous with B in any frame of reference? [link] [comments]  |
| Posted: 22 Jun 2017 05:13 PM PDT |
| Why did some social mammals evolve into patriarchal groups and others into matriarchal groups? Posted: 22 Jun 2017 09:04 AM PDT Specifically looking for an answer outside of the context of human culture. For example, elephants, meerkats, lions, and killer whales all live in matriarchies - why did they evolve this way while many other mammals evolved in patriarchies? [link] [comments]  |
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