Is it difficult to determine the password for an encryption if you are given both the encrypted and unencrypted message? |
- Is it difficult to determine the password for an encryption if you are given both the encrypted and unencrypted message?
- Do any of the Perseids actually "land"?
- Does the presence of heavy elements in the Earth indicate we are made from a remnants of a former supernova? Was it part of the Milky Way? Do we know anything about its nature, stellar environment, or even when it occurred?
- Why do train overhead catenaries use pulleys for tension?
- The Nand Game (nandgame.com) shows how all logic gates can be built out of NAND gates. Can this be done with any logic gate as a starting point, and if not, what makes NAND (and any other gates with which it's possible, if any) special?
- What is the life expectancy of a modern high rise building?
- Why do some drugs and medications (even in generic form) come in specific shapes, like diamonds, squares and circles?
- How does CAR-T cell therapy work?
- Is there a type of 3-Phase power where the phases are offset 90 degrees?
- What exactly is a Laplace Transform?
- Medicine Can somebody explain to me why viruses aren't considered living cells?
- How does an inductive transmitter clamp work? Like one used in pipe locating.
- How do we know that the Earth is as old as it is?
- Is it much harder to synthesize the 119 element than the 118, just because its a new period? If yes, why?
- How do plants "ingest" water, nutrients and minerals?
- What is the role of the ridges (rugae) on the roof of your mouth?
- Why do we make calculations regarding radioactive decay in base e instead of base 1/2?
- Why can’t you use petrol in a Diesel engine?
- How can misfolded proteins cause other proteins to misfold too?
| Posted: 14 Aug 2018 05:33 AM PDT By "difficult" I mean requiring an inordinate amount of computation. If given both an encrypted and unencrypted file/message, is it reasonable to be able to recover the password that was used to encrypt the file/message? [link] [comments]  |
| Do any of the Perseids actually "land"? Posted: 13 Aug 2018 07:00 PM PDT |
| Posted: 13 Aug 2018 07:30 PM PDT |
| Why do train overhead catenaries use pulleys for tension? Posted: 14 Aug 2018 04:17 AM PDT Why is a multiple pulley system like in this picture necessary? Why not have weights directly connected to the wire with only one pulley? [link] [comments]  |
| Posted: 13 Aug 2018 07:31 PM PDT |
| What is the life expectancy of a modern high rise building? Posted: 13 Aug 2018 04:42 PM PDT For a modern or not so modern skyscraper (i.e. Empire State), what is the forecasted due date? I mean, I guess they build and design them with some kind of expected life time. Or are these buildings able to stand up forever as long as they are properly maintained? I am talking about the structural integrity mainly, not so much about all the installations inside. I work with aircrafts and we frequently joke that an aircraft can fly forever if properly maintained (see B52s and many of the war birds from WW2 and earlier still flying). But... Can the structure of a building be "maintained"? [link] [comments]  |
| Posted: 13 Aug 2018 07:06 PM PDT |
| How does CAR-T cell therapy work? Posted: 14 Aug 2018 04:25 AM PDT I've heard good things about the response to CAR-T cell therapy, but fail to grasp exactly how it works. I'm aware there is a Wikipedia article on this, but it seems I'm missing some prerequisite knowledge to fully 'get it'. Reading suggestions also welcome (I have no background in neurology, medicine, oncology). [link] [comments]  |
| Is there a type of 3-Phase power where the phases are offset 90 degrees? Posted: 13 Aug 2018 08:32 PM PDT I have a book that briefly goes over electrical theory and 3-phase power. It shows a sine wave graph with the phases offset 90 degrees (which would leave one 180 degree gap). The paragraph describing this alignment doesn't seem to follow either. I know normally it's 120 degrees apart, but I just wanted to make sure this isn't some special kind of 3-phase. Thanks for the help [link] [comments]  |
| What exactly is a Laplace Transform? Posted: 13 Aug 2018 01:00 PM PDT I am pretty much done differential equations and I know how to do them, but I don't quite understand what they are. I know the derivative of a function is the rate of change at any given point, and the integral of a function is the area under the curve, but what is the Laplace Transform of a function? [link] [comments]  |
| Medicine Can somebody explain to me why viruses aren't considered living cells? Posted: 13 Aug 2018 03:42 PM PDT My knowledge is little about the general structure of viruses but upon research I've come across many debates on whether viruses are or are not living cells. Would anybody be able to clarify this for me? [link] [comments]  |
| How does an inductive transmitter clamp work? Like one used in pipe locating. Posted: 13 Aug 2018 09:49 PM PDT These are circular attachments that go over pipes to energize them for utility line locating. I can't seem to find any graphics of the magnetic field lines or schematics of the inside or anything like that. Is it an iron or metal ring that has part of it wrapped in copper wire with a current ran through it? Really I am trying to build one myself but can't find out what it's made of and they aren't cheap. [link] [comments]  |
| How do we know that the Earth is as old as it is? Posted: 13 Aug 2018 03:27 PM PDT I understand there are many methods of testing radioactive elements in rock, and that the rate of decay can be used to measure how long those elements have been in those rocks, thus telling us approximately when the rock was formed. I also understand that rock, specifically sedimentary rock, forms in layers. rock at the bottom of the Grand Canyon was there before the rock at the top of it; it's impossible to be otherwise. So, we just need to dig a hole as far down as we can and measure that rock, right? Well... once we get to a certain point, it's not the same rock anymore. It either changes into a metamorphic rock, or gets down far enough to melt into magma and then perhaps become igneous rock through some other process. This means, in my mind, there must be a limit to how deep we can go before we run out of rocks we can reliably test. Either this is true, and there is some method of testing I don't understand, or I don't understand the rock cycle. Either way, please teach me! [link] [comments]  |
| Posted: 13 Aug 2018 02:28 PM PDT Ive heard about the hypothetical new orbitals that the 8th period and so on would have, but Id like to know how hard is it to actually create it using the methods we have used for the 115-118 elements? [link] [comments]  |
| How do plants "ingest" water, nutrients and minerals? Posted: 13 Aug 2018 03:44 PM PDT |
| What is the role of the ridges (rugae) on the roof of your mouth? Posted: 13 Aug 2018 06:36 AM PDT |
| Why do we make calculations regarding radioactive decay in base e instead of base 1/2? Posted: 13 Aug 2018 03:55 PM PDT The equations in base 0.5 seems so much more straightforward: N0 = Nt (0.5)t/h Instead of in the base e where lambda have to be introduced as L = ln2/h And then plugged into the equation: N0 = Nt (e)-Lt [link] [comments]  |
| Why can’t you use petrol in a Diesel engine? Posted: 13 Aug 2018 01:55 PM PDT What about the molecular shape and size make this impossible? Or am I completely off about it being that? [link] [comments]  |
| How can misfolded proteins cause other proteins to misfold too? Posted: 13 Aug 2018 01:01 AM PDT |
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