Hi, my name is jack, I'm 14 years old, and I love Baseball. I would like to know when a pitcher throws a baseball, how does it curve? |
- Hi, my name is jack, I'm 14 years old, and I love Baseball. I would like to know when a pitcher throws a baseball, how does it curve?
- How far away from an explosion do I have to be to be safe enough to walk like a cool guy and not look at it?
- Why is -1 times -1 equal to +1 and not -1 or something totally different?
- what is the process for writing data on a cd and how do dvd players read the data?
- In a vacuum, will an electron cloud expand to fill a volume like a gas?
- Can I repeatedly donate my liver since it can completely regenerate?
- Why aren t we using onboard laser for propulsion?
- How different would be the universe if force fields, specifically electromagnetic and gravitational, decayed not by the square but linearly with distance?
- How did engineers/machinists create the first precise straight edge?
- What is the diameter of a bolt of lightning?
- Why don't I, as an adult, seem to get earaches anymore? They seemed common as a child, but I've never had one after my preteen years.
- Why does a camera obscura/pinhole camera work?
- Why do fireworks make different sounds?
- Tourette syndrome was first described in 1885; surely the syndrome was an object of reality for many people around the world, before the first case was diagnosed. So why was it not diagnosed earlier?
- How do efficient video codecs like HEVC and VP9 work?
- One technique astonomers use to discover new planets is by looking at the "wobble" of the star it is orbiting. Is there an assumption that there is the only one planet orbiting the observed star and if not, how do they determine the qualities, like mass, of the planet without the assumpion?
- Is the strength of gravitational pull in planets only defined by it's size, or does the density of the material it mostly consists of affect aswell?
- There are many animals that dance. Are there any animals that dance to music ?
- Can non-ionized radiation cause genetic mutations?
- When polling controversial topics, is there a "too shy to admit bias"?
- Can something escape a Black Hole (after crossing the threshold) by being pulled by a nearby gravity?
- When I undo an action on a word document, does it run the action in reverse or revert to a saved copy of what the document was like before the action?
- Could an alien civilization on Proxima B discover Earth using the same technology we used to discover Proxima B?
| Posted: 30 Aug 2016 10:53 AM PDT I found this gif on my front page as soon as I made an account here so it kind of helps me make the question more clear. Here is a pitcher throwing what is known to be a "Knuckleball" and it has a lot of breakdown to it, I want to know what makes a ball curve like this. https://gfycat.com/WhichUnnaturalAsianlion Thank you everyone. And remember science rules! [link] [comments]  |
| Posted: 31 Aug 2016 04:11 AM PDT |
| Why is -1 times -1 equal to +1 and not -1 or something totally different? Posted: 31 Aug 2016 05:12 AM PDT |
| what is the process for writing data on a cd and how do dvd players read the data? Posted: 31 Aug 2016 05:21 AM PDT 'Computing' Sorry im 13 and my English is patchy at times. Thank you in advanced :) [link] [comments]  |
| In a vacuum, will an electron cloud expand to fill a volume like a gas? Posted: 31 Aug 2016 06:33 AM PDT |
| Can I repeatedly donate my liver since it can completely regenerate? Posted: 31 Aug 2016 07:07 AM PDT IIRC that the liver is the only organ capable of regenerating completely. And should I? [link] [comments]  |
| Why aren t we using onboard laser for propulsion? Posted: 31 Aug 2016 01:49 AM PDT So if we can use laser (on ground) to accelerate a spacecraft, wouldn t it be possible to mount that laser onto the spacecraft and shooting it at earth to get thrust? And wouldn t that mean we could accelerate in space only with electricity? And if we dont get thrust by shooting a laser into space, couldn t we just point that laser on a solar sail or something to get thrust from the sail? Am I missing something? [link] [comments]  |
| Posted: 31 Aug 2016 04:11 AM PDT It's a pretty useless hypothetical question, but it sounded interesting during the morning ride. [link] [comments]  |
| How did engineers/machinists create the first precise straight edge? Posted: 30 Aug 2016 04:28 PM PDT If I had to create a good straight edge from scratch, my first thought would be to pour molten tin on top of molten glass for a flat surface, then fold the cooled tin sheet, as it seems from experience that folding creates a straight edge, though I've never heard how precise it is. But I assume the above process for making a flat surface may not have been known in antiquity, so I'm wondering how and if they did it. [link] [comments]  |
| What is the diameter of a bolt of lightning? Posted: 30 Aug 2016 06:34 PM PDT What is the diameter of a bolt of lightning? Is it even a circle, or does it vary in shape or size, and if it does, what kind of variables factor into this? [link] [comments]  |
| Posted: 31 Aug 2016 07:08 AM PDT Is it just a cognitive bias on my part? I don't know any adults that have ever had or talked about having earaches after childhood. [link] [comments]  |
| Why does a camera obscura/pinhole camera work? Posted: 31 Aug 2016 12:56 AM PDT From what I understand of the rectilinear prorogation of light, ray of light travel straight and I'm assuming parallel to each other unless they are scattered by the particles in the atmosphere. The usual representation of how camera obscura works is represented like this but in reality it shouldn't it be like this instead. I know scatterings got to do something with it. The way I imagine it is that light is scattered in every angle lowering its intensity and the pinhole just let's the scattered light in a so that an image is formed like this. But if that's the case shouldn't the middle part where the pinhole is be brighter than the rest if the image like this? What am I missing? [link] [comments]  |
| Why do fireworks make different sounds? Posted: 31 Aug 2016 12:51 AM PDT |
| Posted: 31 Aug 2016 06:37 AM PDT |
| How do efficient video codecs like HEVC and VP9 work? Posted: 31 Aug 2016 02:30 AM PDT What "magic" does HEVC use to get excellent quality at similar filesizes to h.264? Also, I've heard that it's possible to encode a video mathematically losslessly in HEVC. While lossy audio and images are of course much smaller in filesize than lossless ones, is the same thing true for HEVC video? Also, given the efficiency of these codecs, why are software-only decoders regarded as a bit "slow"? I understand this approach may be slower than native hardware support, however, comparing purely software based implementations, does HEVC not show a great benefit over h.264 in regards to bandwidth and the like? Thank you! [link] [comments]  |
| Posted: 31 Aug 2016 06:10 AM PDT |
| Posted: 30 Aug 2016 06:06 PM PDT For example, since Jupiter is a planet mostly made of gas, if we had another planet that was exactly the same size but was consisted mostly of a material that is more dense, would its gravitational pull be stronger? [link] [comments]  |
| There are many animals that dance. Are there any animals that dance to music ? Posted: 30 Aug 2016 08:43 PM PDT Dancing spiders, birds being the most obvious examples. Any animals "feel the beat"? [link] [comments]  |
| Can non-ionized radiation cause genetic mutations? Posted: 31 Aug 2016 05:16 AM PDT So it's well known ionized radiation like ultraviolet can cause genetic mutations, but can something with less energy like radio waves cause mutations? [link] [comments]  |
| When polling controversial topics, is there a "too shy to admit bias"? Posted: 30 Aug 2016 11:32 AM PDT Sometimes polls are about controversial topics and people hide their true opinion. So when they make polls per telephone there might be a strong bias. Is this considered in good polls? Is this just a marginal effect? [link] [comments]  |
| Posted: 30 Aug 2016 02:26 PM PDT I'm not well versed in relativity, but I think that things can't escape a black hole once they cross a certain threshold because their escape velocity becames higher than the speed of light. However, say if after an object enters such threshold, something like a star was pulled near the black hole, couldn't its gravity pull the object back through the old threshold? In other words, couldn't the escape velocity became lower (than the speed of light) if a star comes close enough to the hole? [link] [comments]  |
| Posted: 31 Aug 2016 03:57 AM PDT |
| Posted: 30 Aug 2016 11:35 PM PDT As has been widely reported, scientists recently announced that an Earth-like planet has been discovered around one of our closest neighboring stars, Proxima Centari, using techniques that look for wobble/Doppler shift of the parent star. My question is, would a theoretical alien civilization on Proxima B, using similar techniques and technology as our own, be able to detect the presence of Earth? We have 8 planets in our own solar system, all perturbing the sun to some degree, so is their a technique to screen out large gas giants, like Jupiter and Saturn, from the relatively small Earth and Mars? [link] [comments]  |
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