Why do things get darker when wet? |
- Why do things get darker when wet?
- What happened to acid rain? I remember hearing lots about it in the early 90s but nothing since.
- Does dust affect space telescopes such as Hubble?
- Why isint Rubidium more conductive than Copper?
- Companies making washing detergent have been launching new and improved products for years. So what's the difference between a detergent sold in 1978 and one on sale today?
- If each neutrino flavor has a different mass and this phase shifts their wave packet as they move causing oscillation, why isn't the wave packet stretched over long distances?
- Can you get muscle cancer?
- How do our bodies know when to wake up? What stops us from sleeping forever?
- Does the general theory of relativity predict that the universe is expanding?
- Have their been any more gravitational wave detections?
- Can you catalyze the aluminum - gallium - water reaction?
- What's the difference between the South and North pole of a magnet?
- Why is SHA256 not a good hash for passwords?
- How does a device keep it’s hostname?
- Why are Rivers Uneven and as a Result Turbulent?
| Why do things get darker when wet? Posted: 05 Jun 2018 02:05 PM PDT |
| What happened to acid rain? I remember hearing lots about it in the early 90s but nothing since. Posted: 06 Jun 2018 04:56 AM PDT |
| Does dust affect space telescopes such as Hubble? Posted: 06 Jun 2018 05:19 AM PDT There must be a huge amount of isolated dust particles in Space, particularly around Earth's atmosphere. I was wondering if dust gets stuck to Hubble's (and other telescopes') lenses or even damages the lenses due to the velocity it travels at? How do Space agencies deal with this issue? [link] [comments]  |
| Why isint Rubidium more conductive than Copper? Posted: 06 Jun 2018 04:14 AM PDT Title. They both form a 1+ ion (mainly) but Rubidium has less attraction towards it's outer electron than copper, because of electron shielding and atomic radius, suggesting that it's valence electrons should be more mobile than copper, hence Rubidium should be more conductive. This however is not the case - why not? [link] [comments]  |
| Posted: 06 Jun 2018 03:58 AM PDT |
| Posted: 06 Jun 2018 06:34 AM PDT I'm trying to understand how neutrinos oscillate and I read that because each flavor has a different mass (the sum of all 3 is less than 1 millionth of an electron's mass) this causes their wave packet to phase shift but wouldn't this stretch out the wave packet over long distances so when the neutrino is in its heaviest form it would slow down? I guess mass can't change so how does this work? They found a 4th neutrino that's apparently heavier and sterile which is what got me thinking about this: https://science.slashdot.org/story/18/06/05/2036233/scientists-may-have-discovered-a-new-fundamental-particle-sterile-neutrino [link] [comments]  |
| Posted: 06 Jun 2018 05:45 AM PDT I heard cancers from everywhere from testicles to brain, but i have never once heard of muscle cancer. [link] [comments]  |
| How do our bodies know when to wake up? What stops us from sleeping forever? Posted: 05 Jun 2018 01:43 PM PDT |
| Does the general theory of relativity predict that the universe is expanding? Posted: 06 Jun 2018 01:08 AM PDT |
| Have their been any more gravitational wave detections? Posted: 05 Jun 2018 09:10 PM PDT |
| Can you catalyze the aluminum - gallium - water reaction? Posted: 05 Jun 2018 12:18 PM PDT I've read that the reaction is good at producing hydrogen, yet the limiting factor is that it produces it very slowly. Does anyone know of any research done into accelerating this reaction? [link] [comments]  |
| What's the difference between the South and North pole of a magnet? Posted: 05 Jun 2018 10:04 AM PDT An expirmental physicist is magically teleported to another planet. The physicist has access to any instrument or piece of equipment they desire EXCEPT a magnet or compass from Earth (and its magnetic field) with the poles labeled "North" and "South." How could they tell which pole of a magnet is which? [link] [comments]  |
| Why is SHA256 not a good hash for passwords? Posted: 05 Jun 2018 10:19 AM PDT I've read that for password hashing, hash functions such as Bcrypt or PBKDF2 are preferable because they are much slower to calculate. SHA256 was not good because it was very fast to compute. However, just as people recommended to have multiple iterations of hashing for Bcrypt, couldn't I have multiple iterations of SHA256 hashing for each password? What makes a SHA256 password hashed 1 million times iteratively worse than a Bcrypt password hashed 1000 times? [link] [comments]  |
| How does a device keep it’s hostname? Posted: 05 Jun 2018 08:25 AM PDT When a device with a hostname is disconnected and reconnected to a network, how is it reassigned the hostname given by the network? [link] [comments]  |
| Why are Rivers Uneven and as a Result Turbulent? Posted: 05 Jun 2018 12:46 PM PDT I am currently studying lithosphere, hydrosphere and physical geography topics and understand erosional and depositional features along with differential erosion. We do not study rivers as much as I thought we would. As a result I have a few questions which extend from my first: Why are not all river beds flat? Where I live the rivers have ledges of the same rock which I assume is what causes turbulence and localised white water- what causes the rock to be deformed like this? Is it correct to assume that this is how turbulence solely arises? I do know some rivers are flat and merely run along the path of least resistance. Any further reading or recommendations to textbooks would be appreciated. [link] [comments]  |
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