Does a person using a skateboard expend less energy than a walking person traveling the same distance? |
- Does a person using a skateboard expend less energy than a walking person traveling the same distance?
- Can liquid water exist on planets with extremely high gravity?
- Why does anxiety cause digestive issues?
- How was the number of atoms in a mole calculated?
- What did mathematician Ron Graham mean by saying that the number 2^120 is "beyond what computers can do; no computer can do 2^120 things right now" ?
- Is there any reason to rule out the possibility of multiple universes separated by distance?
- If time is sped up with gravity, then shouldn't the black hole that formed with our galaxy already have undergone Hawking radiation?
- How is parental DNA analysis performed?
- How do blood clots pass through the blood brain barrier?
- How do people with cerebral palsy and similar neurological disorders still retain neural plasticity?
- What method is better for survivability when jumping off a building? Landing with a mattress or landing on a mattress?
- Can ionizing radiation knock an electron out of one atom and into another?
- If I were to extrude a perfectly straight bar, would it go around the Earth or out to space?
- Is a carbon molecule C=C=C=C... possible?
- Can I get intoxicated by smelling alcohol?
- What happens to the DNA in transplanted organs?
- Can you harness the heat and friction from the brakes of a car to charge a battery in an electric car?
- Where is our solar system "going"?
- If I have a cup of coffee with cream, drink half the contents, refill it with only black coffee, and repeat infinitely, will there ever be zero cream in the cup?
- Why do some animals eyes glow when they look into a camera, but not people?
- Light Thrust?
| Posted: 10 Jun 2016 07:01 PM PDT Yes, I know. Strange question. But I was watching a neighbor pass by my house on a skateboard today, and I started wondering about the physics of it. Obviously, he was moving between points A and B on his journey faster than he would be walking. But then again, he also has to occasionally use one foot to push against the ground several times to keep the momentum of the skateboard moving forward at a higher speed than if he was just walking. My question is basically is he ending up expending the SAME amount of total energy by the "pushing" of his one foot while using the skateboard as he would if he was just walking the same distance traveled using two feet? Assume all other things are equal, as in the ground being level in the comparison, etc. My intuition says there is no such thing as a "free energy lunch". That regardless of how he propels his body between two points, he would have to expend the same amount of energy regardless whether he was walking or occasionally pushing the skateboard with one foot. But I'm not sure about that right now. Are there any other factors involved that would change the energy requirement expended? Like the time vs distance traveled in each case? EDIT: I flaired the question as Physics, but it might be an Engineering question instead. [link] [comments]  |
| Can liquid water exist on planets with extremely high gravity? Posted: 10 Jun 2016 07:11 PM PDT Can water exist in its liquid state on a planet like Jupiter, or does its extremely strong gravity compress it down somehow? I was thinking of this in the context of which exoplanets could host life, which as far as we know requires liquid water. Would the physical systems that make life on earth possible be able to function on a planet with extremely high gravity, or do they become too "smushed" down? [link] [comments]  |
| Why does anxiety cause digestive issues? Posted: 10 Jun 2016 09:10 PM PDT |
| How was the number of atoms in a mole calculated? Posted: 10 Jun 2016 10:02 PM PDT How was Avogadro's number discovered and measured? [link] [comments]  |
| Posted: 10 Jun 2016 05:06 PM PDT I've recently been reading about Graham's number and decided to watch a few YouTube videos. This one, with him explaining it, is what I'm referencing in the title. How do we measure the total power of computers? And how would we go about doing that at any given time? [link] [comments]  |
| Is there any reason to rule out the possibility of multiple universes separated by distance? Posted: 10 Jun 2016 06:52 PM PDT Similarly to how we have multiple galaxies separated by distance. Obviously, it's impossible to actually verify, but is there any reason to believe that there do not exist other universes some unknown distance away from the edge of our observable universe? I suppose, for the sake of discussion, I'm defining "universe" to be a physical grouping of galaxies similar to our own universe. [link] [comments]  |
| Posted: 11 Jun 2016 01:51 AM PDT From the perspective of the black hole, time farther away from it would seem like a stand still. Much like in the movie, "Interstellar" where one hour on the planet orbiting a black hole equals 7 Earth years. Now, I understand that it takes a very very very long time (10100 years) for a black hole to undergo Hawking Radiation, but shouldn't the relativity of time inside the event horizon be exponentially sped up compared to time experienced on Earth? Wouldn't this make it so that Sagittarius A* would have already gone through all those years through time dilation and no longer be there? [link] [comments]  |
| How is parental DNA analysis performed? Posted: 10 Jun 2016 08:44 PM PDT I was explaining to a co-worker how DNA historical analysis is accurate for fathers but not for mothers of an individual. I have been lead to believe that it is the haploid sperm cell that carries the mitochondrial gene that is used for parental analysis. I was unable to clarify further than that, and I was wondering if I was incorrect or how I could further clarify my statement. Thank you. [link] [comments]  |
| How do blood clots pass through the blood brain barrier? Posted: 10 Jun 2016 09:42 PM PDT I thought that the blood brain barrier filters out large molecules. So wouldn't a clot be way large enough to be filtered out? Am I simplifying this too much or is there more to the brain blood barrier that I do not know. [link] [comments]  |
| How do people with cerebral palsy and similar neurological disorders still retain neural plasticity? Posted: 10 Jun 2016 07:25 PM PDT |
| Posted: 10 Jun 2016 08:44 PM PDT |
| Can ionizing radiation knock an electron out of one atom and into another? Posted: 10 Jun 2016 09:11 PM PDT Can radiation expel an electron out of the 'orbit' of one atom and into another, and would this electron then become part of that atom? Could it potentially collide with a proton, and what would happen if it did? [link] [comments]  |
| If I were to extrude a perfectly straight bar, would it go around the Earth or out to space? Posted: 10 Jun 2016 11:57 AM PDT Let's propose we have a fantastical material that doesn't bend, stretch, compress, shear, whatever. I have a machine which if I were to point directly up, would extrude a continuous bar of material straight up. If I position it parallel to the ground, would the extruded bar wrap around the surface of the planet, as gravity warps space so as to be flat all the way around, or would it eventually leave the atmosphere due to the relative curvature of the Earth? [link] [comments]  |
| Is a carbon molecule C=C=C=C... possible? Posted: 11 Jun 2016 02:49 AM PDT I was reading about carbon nanotubes and graphene and thought that surely a single atom diameter strand of carbon would be even stronger. [link] [comments]  |
| Can I get intoxicated by smelling alcohol? Posted: 10 Jun 2016 04:55 PM PDT |
| What happens to the DNA in transplanted organs? Posted: 10 Jun 2016 11:21 AM PDT I understand that cells are replaced as they die and all tissues and organs are eventually entirely replaced. Does the amount of cells in the donor organ that has the DNA of the donor stay the same through the lifetime of the recipient? There must be some transition point between donor and recipient tissue, right? What happens at that point at a cellular level? [link] [comments]  |
| Posted: 10 Jun 2016 04:35 PM PDT |
| Where is our solar system "going"? Posted: 10 Jun 2016 12:44 PM PDT I have a few questions about our solar systems orbit;
Thanks in advance! [link] [comments]  |
| Posted: 10 Jun 2016 01:42 PM PDT Assume this is a homogenous solution. I drink the same amount each time and refill to the same level each time. I know the cream will eventually be a negligible amount but will it ever be gone completely? [link] [comments]  |
| Why do some animals eyes glow when they look into a camera, but not people? Posted: 10 Jun 2016 02:19 PM PDT |
| Posted: 10 Jun 2016 07:08 AM PDT This is my first question in AskScience so forgive me if its been asked before. My question pertains to the properties of light, particularly its very special property of always finding the shortest travel distance. Why does this happen ? Also, I was just pondering ideas about how no object can attain the speed of light. However, is it possible to use light itself as mechanism of thrust? Realistically this doesn't seem possible to me because light is somewhat mass less and am unsure if it would even produce a force. [link] [comments]  |
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