Is there an optimal angle when dragging an object across the ground? |
- Is there an optimal angle when dragging an object across the ground?
- How is quantum tunneling limited by speed of light?
- Over time do nuclear warheads become less powerful?
- Can sound pass through the star when a supernova explodes?
- How does a species evolve to have a different number of chromosomes? Wouldn't the first individual with that mutation be unable to mate with any other individuals, and so the mutation would instantly die off?
- Did the Great Wall of China affect the environment around it when it was built?
- Could the large hadron collider accelerate a Bucky ball?
- How does a group, such as NASA, even begin to set a rocket in the right direction?
- Is there less oxygen in the atmosphere during the winter when there are no leaves on the trees?
- what happens if two inbred people from different families have kids?
- Does the small intestine stay stagnant in one position or do the tubes move around freely?
- Was the first sonic boom a surprise?
- How is SF6, Sulphur Hexafluoride, possible as an atomic arrangement? How does it violate the octet rule?
- How are bats' organs adapted to sleeping upside down?
- How is use of a Coulomb potential in solutions to the Schrödinger equation for single electron systems justified?
- What's the highest decibel sound we could possibly create?
- If matter and antimatter annihilate in a vacuum, what form does the released energy take? Gamma? IR? X-rays?
- If I were standing on the surface of the moon, and shot a gun parallel to the ground, how fast would the bullet have to go so that it fully orbited the moon just above the ground level?
- Why doesn't the blue light from the sky cast a blue shade on the ground?
- If mathematical models of artificial neural networks are so effective, wouldn't creating physical models of neural networks be even more effective?
| Is there an optimal angle when dragging an object across the ground? Posted: 13 Oct 2017 11:48 AM PDT I watched an oxen pull competition last weekend and a conversation surrounding efficiency came up. The oxen (less than 2900lbs) were dragging a 1000lbs (steel) sled with 6000lbs of weight added to it across dirt. The rope connecting the two was somewhere between a 30-45 degrees incline. What is the most efficient way to drag this sled? A rope with no incline or is the upward force to reduce frictional force more efficient? [link] [comments]  |
| How is quantum tunneling limited by speed of light? Posted: 14 Oct 2017 01:36 AM PDT My understanding is that a particle "exists" in the entire universe at varying probabilities, and can be measured at literally any point. Instead of a very short distance, let's say a particle is going to tunnel one light second away. Does it take one second? Does it happen instantly? Is there really a frame of reference that shows it arriving before it's left? [link] [comments]  |
| Over time do nuclear warheads become less powerful? Posted: 14 Oct 2017 06:08 AM PDT |
| Can sound pass through the star when a supernova explodes? Posted: 14 Oct 2017 04:50 AM PDT Sound needs a medium, so there's no sound in space. However, I was wondering if sound could pass through the immensely dense star while it explodes. [link] [comments]  |
| Posted: 13 Oct 2017 05:57 PM PDT |
| Did the Great Wall of China affect the environment around it when it was built? Posted: 13 Oct 2017 01:47 PM PDT |
| Could the large hadron collider accelerate a Bucky ball? Posted: 13 Oct 2017 07:54 AM PDT |
| How does a group, such as NASA, even begin to set a rocket in the right direction? Posted: 13 Oct 2017 03:35 PM PDT It never ceases to astonish me how rockets, being so small relative to planets, can be targeted with almost dead accuracy in space to reach places like Pluto. How would anyone (or anything) even begin to calculate where the rocket needs to go or what it needs to do to get to its destination? [link] [comments]  |
| Is there less oxygen in the atmosphere during the winter when there are no leaves on the trees? Posted: 13 Oct 2017 01:28 PM PDT |
| what happens if two inbred people from different families have kids? Posted: 13 Oct 2017 06:08 PM PDT |
| Does the small intestine stay stagnant in one position or do the tubes move around freely? Posted: 13 Oct 2017 02:40 PM PDT This question comes from something I saw on the television show House. During a surgery, House is checking a patient's intestines for granulomas and during the process he seemed to be moving the small intestine around a lot. Would it have been important for the doctors to place the small intestines in a specific way or would they have fine as long as there were no kinks? Do the intestines move around much during physical activities? [link] [comments]  |
| Was the first sonic boom a surprise? Posted: 13 Oct 2017 01:56 PM PDT I'm having a weirdly hard time figuring out from google if the sonic boom from the first supersonic flight (Chuck Yeager in 1947) was expected or if it was a surprise and the physics explaining it came after. [link] [comments]  |
| Posted: 13 Oct 2017 03:47 PM PDT Sulphur only has two valence electrons to form bonds. Can anyone explain how a Sulphur Hexaflouride molecule is able to exist in a stable state? [link] [comments]  |
| How are bats' organs adapted to sleeping upside down? Posted: 13 Oct 2017 08:46 AM PDT I know why they sleep upside down and that tendons in their legs "cramp up" to make sure they hold on pretty tight. But how are their internal organs arranged? Doesn't blood flow to their brains like in humans turned upside down? [link] [comments]  |
| Posted: 13 Oct 2017 01:20 PM PDT Atoms / ions with a single electron such as Hydrogen are often given as the most complicated systems for which analytical solutions of the (electronic) Schrödinger equation have been determined. In deriving these solutions, the potential energy is invariably (in my searching) given by the Coulomb potential with a defined nucleus - electron vector. This raises a few questions for me. How is this justified in the context of a theory in which neither particle can have an arbitrarily well-defined position? How has the Coulomb interaction been shown to apply to quantum mechanical systems? Thanks for any insight you can share! [link] [comments]  |
| What's the highest decibel sound we could possibly create? Posted: 13 Oct 2017 06:01 PM PDT Using current technology what would be the loudest sound we could muster? What would it take? Could we approach Krakatoa levels? [link] [comments]  |
| Posted: 13 Oct 2017 12:11 PM PDT |
| Posted: 13 Oct 2017 08:11 AM PDT And is the average velocity of a bullet from a standard rifle enough to do this? [link] [comments]  |
| Why doesn't the blue light from the sky cast a blue shade on the ground? Posted: 13 Oct 2017 12:42 PM PDT I can understand in locations under direct sunshine--the light from the sun overwhelms any light refracting from the sky. But in locations that have a view of the sky but not the sun, why doesn't the light cast a shade of blue on everything? [link] [comments]  |
| Posted: 13 Oct 2017 07:38 AM PDT |
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