Does passing light though a prism in space or water or ice change the separation of colors? |
- Does passing light though a prism in space or water or ice change the separation of colors?
- Why is the amount of work required to accelerate a body from 10m/s to 20m/s three times the work needed to accelerate a body from 0m/s to 10m/s?
- Is there a height limit to building skyscrapers?
- Why wouldn't matter falling into a black hole decrease entropy in the universe?
- A twist on the question "Why doesn't the moon fall into the earth?"
- If two ships travel at higher then 0.5C away from each other, would light from one ever reach the other?
- How come, e can be proven in so many different ways? What is so significant about 2,718..?
- What are cooper pairs ?
- There's a glass of water on a perfectly flat and horizontal surface. Is the top of the surface of the water perfectly flat too? If not, what is the maxium height difference of its particles at the top?
- How can a river originate in a swamp?
- Can someone explain why this doensn't/can't work? (perpetuum mobile, metalball in a wheel+magnet)
- How is the Contraluz Opal formed?
- How do insects such as ants and bees not suffer the same consequences of inbreeding as other animals such as Humans?
| Does passing light though a prism in space or water or ice change the separation of colors? Posted: 11 Jan 2016 03:13 AM PST Textbook section on refraction: "A change in direction of a beam of electromagnetic radiation at a boundary between two materials having different refractive indices. It is refraction at the interface between glass and air that causes a prism to bend light and for a lens to focus it." Replace the two boundaries with whatever you like, will it change the results? [link] [9 comments]  |
| Posted: 10 Jan 2016 06:37 AM PST The kinetic energy of a body moving at 10m/s is 50*mass and the kinetic energy of a body moving at 20m/s is 200*mass. The work required to accelerate the body from 10 to 20m/s is 200-50=150*mass, or three times the 0-10 acceleration. This seems really counterintuitive because it would seem that as the body gets faster it is harder to accelerate it further i.e. you would need to do more work. What does the force acting on the body care about the speed at which the object is moving if it just wants to accelerate it another 10m/s? What am I missing here? (I know that the formulae say that it behaves this way but I just can't grasp it.) [link] [318 comments]  |
| Is there a height limit to building skyscrapers? Posted: 10 Jan 2016 07:54 AM PST |
| Why wouldn't matter falling into a black hole decrease entropy in the universe? Posted: 10 Jan 2016 07:36 AM PST This video https://www.youtube.com/watch?v=gS_C7dM25pc states that entropy in a closed system must stay the same or increase, and implies that one form of low entropy is a neat arrangement of matter. If matter in a black hole is arranged at a single point and therefore very orderly, how does matter falling into a black hole obey the rule of same or increasing entropy? [link] [84 comments]  |
| A twist on the question "Why doesn't the moon fall into the earth?" Posted: 10 Jan 2016 04:31 PM PST If my frame of reference is above the earth and moon looking directly down, such that the orbit of the moon is (for the sake of argument) a circle around the static earth, and is rotating at the same angular speed as the orbit of the moon so that it too is static, then why wouldn't the moon get pulled into the earth by the gravitational pull. [link] [14 comments]  |
| Posted: 11 Jan 2016 06:34 AM PST Basically title. From my understanding, I believe the answer would be no, but just want clarification. [link] [2 comments]  |
| How come, e can be proven in so many different ways? What is so significant about 2,718..? Posted: 10 Jan 2016 11:52 AM PST |
| Posted: 10 Jan 2016 06:41 PM PST |
| Posted: 10 Jan 2016 11:53 AM PST It seems flat and all, but since water is made of molecules with a non-zero size, there must be some difference, right? [link] [9 comments]  |
| How can a river originate in a swamp? Posted: 10 Jan 2016 09:44 AM PST For example, the Ashley River in Charleston, SC originates in a large inland swamp and eventually empties into the Atlantic. How does this decently sized river constantly emptying the swamp water never "run out"? [link] [4 comments]  |
| Can someone explain why this doensn't/can't work? (perpetuum mobile, metalball in a wheel+magnet) Posted: 10 Jan 2016 01:43 PM PST LINK: https://www.facebook.com/fizikist/videos/943426745706464/ I'm pretty confident that this is not the solution to the worlds energy problem and therefore also no perpetuum mobile. But can someone please give me the scientific explanation why and how this doesn't/can't work? Greetings R. PS: sorry that this is a facebook link, but got no other source [link] [4 comments]  |
| How is the Contraluz Opal formed? Posted: 10 Jan 2016 11:37 AM PST How exactly is the Contraluz Opal or other similar gems formed? [link] [comment]  |
| Posted: 10 Jan 2016 02:35 PM PST I was under the impression that all bees in a colony share the same mother: the queen. Doesn't that cause an extreme lack of diversity in their gene pool? That kind of inbreeding causes an array of problems in humans. [link] [1 comment]  |
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