- AGU AMA: I’m Dr. Kim Cobb, and I’m here to talk about the science of climate change, El Niño, and the reconstruction of past climate. And I’m Dr. Anne Jefferson, and I’m here to talk about how water moves through landscapes and how land use and climate change alter hydrology. Ask Us Anything!
- If you were to drive in a car at the same speed as a bullet and shoot backwards, would the bullet hang in mid-air? If so, how long?
- In Terminator, when they say skynet "begins learning at a geometric rate," what does that mean?
- What base are the Roman numbers?
- Is it possible to calculate the initial velocity and angle of a basketball shot, knowing only the angle at which it enters the hoop?
- Why are so many of the energy levels of a hydrogen atom degenerate?
- If you want to equally divide an n-shaped baked dish between x amount of people, how do you optimize slice size (and shape)?
- If you were traveling at 99.9% the speed of light, and you fired a gun, would the bullet fly at the speed of light?
| Posted: 18 Apr 2016 04:50 AM PDT Hi Reddit! I am Kim Cobb, Professor and Georgia Power Scholar in the School of Earth and Atmospheric Sciences at the Georgia Institute of Technology. I am also Editor of Geophysical Research Letters. My life's work is dedicated to unlocking the patterns of past climate changes from corals and cave stalagmites, with a particular focus on El Niño. With the current record-breaking event still underway, it's been a busy year full of field expeditions to my remote research sites. Together with my students, we've been able to uncover the first evidence that El Niño events may be strengthening in response to anthropogenic climate change. Most recently, I participated in an interdisciplinary expedition that documented extensive coral mortality on an island in the very middle of the Pacific. I enjoy tweeting at @coralsncaves, and blogging (infrequently) at http://cobblab.blogspot.com. In my spare time, I'm raising four children ages 5-8. You can view my lab web-page at http://shadow.eas.gatech.edu/~kcobb I am Anne Jefferson, recently tenured faculty in the Department of Geology at Kent State University. I am also a AAAS Public Engagement Fellow. My research answers questions like "What happens to streams when climate changes from snow to rain in the winter?" and "How can we manage stormwater to mitigate the effects of urbanization and prepare for climate change?" and "Does stream restoration work?" I've studied water everywhere from groundwater deep below lava flows to the mighty Mississippi River, from green rooftops to the pipe network below our streets. I am a physical hydrologist and I spend a lot of time carefully measuring how much water there is, how it's moving, where it has come from, and how old it is. I also I collaborate with scientists who study water quality, stream ecology, landscape architecture, and human institutions. Water is a very interdisciplinary subject! Learn more about my work on my web page: http://all-geo.org/jefferson/. Follow me on Twitter: https://twitter.com/highlyanne. We will be back to answer your questions between 12 and 1 pm EDT on Monday, April 18th, Ask Us Anything! [link] [comments]  |
| Posted: 17 Apr 2016 08:37 AM PDT |
| In Terminator, when they say skynet "begins learning at a geometric rate," what does that mean? Posted: 17 Apr 2016 08:54 PM PDT |
| What base are the Roman numbers? Posted: 17 Apr 2016 10:33 AM PDT It seems to me that they have no base. They have 7 symbols (I,V,X,L,C,M) but it isn't a base 7? [link] [comments]  |
| Posted: 17 Apr 2016 10:12 AM PDT I was discussing this with my physics teacher and he was not able to calculate it. You do know the distance from the hoop, the starting height of the shot, the hoops height and the angle at which the ball enters the hoop. In our example, the ball enters at 34 degrees. Is there any way to calculate the initial velocity and the angle at which the ball was shot? [link] [comments]  |
| Why are so many of the energy levels of a hydrogen atom degenerate? Posted: 17 Apr 2016 06:55 AM PDT Specifically, why does the one-electron model have degenerate orbitals for all energy levels with identical principal quantum numbers, and why is this unique to only the one-electron model? I've tried googling and reading textbooks but all I get are how some of the p and s orbitals are degenerate due to their mathematically indistinguishable(?) properties. Something to do with [2, 1, 1] being identical to [1, 1, 2] in terms of energy considerations. Sorry for being slightly incoherent, I read up on this about last week and didn't have time to go about clarifying it until now. [link] [comments]  |
| Posted: 17 Apr 2016 07:52 AM PDT I do have an inkling that this might be some sort of optimization problem, but my maths fails me beyond that. So, let us say that we bake a large, rectangular dish of food to divide by x people. We want to minimize the amount of tiny little pieces left after cutting and also want the piece size to be equal for all participants. The slices are rectangular. If the dish is rectangular (sides A and B) and the number of people to divide it to is even, this is pretty easy. But what if there is, say, 17 people, or any odd or prime number? Could there be a generalized solution for an n-sided polygon? How about a solution where the slices can also be any one type of polygon? Is this a problem of irreducible complexity or? [link] [comments]  |
| Posted: 17 Apr 2016 11:18 AM PDT As far as I know, if you're moving then you throw an object, that object moves in relation to you. Could this theoretically happen? [link] [comments]  |
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