Could an electric car have only regenerative brakes and no conventional friction brakes? |
- Could an electric car have only regenerative brakes and no conventional friction brakes?
- Can an object ever get hotter than the thing that’s heating it?
- Can a virus ever be truly airborne?
- How do laser measuring devices have such high precision?
- Has any research been done about the effects of the vaccine on women attempting to get pregnant?
- If Mars needs an atmosphere to be terraformed and carbon dioxide can contribute to thickening the atmosphere, why can’t we kill two birds with one stone and ship the excess carbon dioxide from Earth to Mars?
- How does drain unblocker gel work?
- Vinyl records; how can one needle pick up the vibrations of an entire orchestra?
- Why would the vaccine becoming less effective be all the more reason to get the vaccine?
- will antibodies from natural infection work against the new mutations?
- Any way to tell whether a vaccinated person was previously an asymptomatic COVID-19 carrier?
- Is associative memory the same as episodic memory? Or is there a difference?
- Why is it that alkanes have higher enthalpies of combustion?
- How does the upward force decide if an object floats or not?
- How much soil does a tree actually consume?
| Could an electric car have only regenerative brakes and no conventional friction brakes? Posted: 22 Jan 2021 10:10 AM PST My understanding is that combustion cars have brakes that turn the car's kinetic energy into heat energy, and electric cars have both these conventional brakes and can also do regenerative braking that turns some of the car's kinetic energy into electricity instead of heat. The reason they have both is that regenerative brakes can't apply nearly as much braking force as normal brakes. My question is, would it be possible for regenerative braking to be engineered to be capable of stopping a car just as quickly/effectively as conventional friction brakes can? [link] [comments]  |
| Can an object ever get hotter than the thing that’s heating it? Posted: 22 Jan 2021 10:42 AM PST I had the hot water running on my kitchen sponge fit a couple minutes and it got really hot and got me thinking - is it possible? Object A is a heat source heating up Object B. Under constant heat can Object B ever end up hotter than object A? [link] [comments]  |
| Can a virus ever be truly airborne? Posted: 23 Jan 2021 06:04 AM PST With all the talks about covid being airborne, I was thinking: can there ever be a deadly virus that would survive and multiply in atmosphere like it does in a human body? [link] [comments]  |
| How do laser measuring devices have such high precision? Posted: 22 Jan 2021 12:06 PM PST So I just bought a laser measuring device for around $25. It seems to read down to 1/16 inch precision. Now I got curious and did the math to figure out what the round trip time for light to travel 1/16 inch and its around 1.0E-11 second. So what I am wondering is, how is that even possible to have a micro processor time something that fast. The fastest processor speed that I can find has a clock speed of around 8Ghz. Even if the cheapo components in my $25 laser measure is actually hitting those kind of speeds, the light would travel about 2 inches in one clock cycle, which would mean it could count in inches, not sixteenths. The math says it would need to be counting up around 1800Ghz to count with 1/16" precision. (a 1/16" distance equates to a 1/8" round trip, and a 900Ghz clock will have a 1/8" round trip per tick, but your precision is half your sampling speed, so you need at least double that, right? so 1800Ghz) Is there some other principle going on than simply timing the return trip of the light? The fastest transistors that I can find are in the 300Ghz range. [link] [comments]  |
| Has any research been done about the effects of the vaccine on women attempting to get pregnant? Posted: 22 Jan 2021 12:02 PM PST I've seen it recommended that if you are pregnant, that you do not get the vaccine during that time. As stated in the comments of this previous post: https://www.reddit.com/r/askscience/comments/k6ixqj/has_there_been_any_research_on_covid19_vaccines/ But, has there been any research about receiving the vaccine when you're attempting to get pregnant or plan to be in the near future? The CDC's site says "Women who are trying to become pregnant do not need to avoid pregnancy after receiving an mRNA COVID-19 vaccine." with no other information. But this leads me to believe there have at least been considerations about this, but I can't seem to find any other information. Thanks in advance. [link] [comments]  |
| Posted: 22 Jan 2021 10:15 PM PST Probably a very stupid question, but it doesn't seem like we'll be making any major jumps in cleaning our atmosphere, so why not outsource it? The costs to ship the CO2 would obviously be pretty extraordinary, but we'd be preventing global warming on Earth while building another planet to one day sustain life. It can't be that easy, right? [link] [comments]  |
| How does drain unblocker gel work? Posted: 22 Jan 2021 07:38 AM PST How does it remove hair etc without any need for me to physically do anything? [link] [comments]  |
| Vinyl records; how can one needle pick up the vibrations of an entire orchestra? Posted: 22 Jan 2021 01:02 PM PST Why does it not take one groove for each instrument? I have googled it, but left-right side of the groove equals left-right channel which gives stereo does not explain to me how 2 or 10 or 50 instruments can be represented in just one groove. [link] [comments]  |
| Why would the vaccine becoming less effective be all the more reason to get the vaccine? Posted: 22 Jan 2021 11:47 PM PST A dip in the vaccines' effectiveness would be "all the more reason why we should be vaccinating as many people as you possibly can," Fauci added. "Fauci: New data shows Covid vaccines may be less effective against some strains" https://www.cnbc.com/amp/2021/01/21/dr-fauci-says-covid-vaccines-appear-to-be-less-effective-against-some-new-strains.html [link] [comments]  |
| will antibodies from natural infection work against the new mutations? Posted: 22 Jan 2021 07:35 PM PST i am aware that the vaccines work on the UK variant and maybe the others as well. i am wondering if when you originally get covid and develop antibodies will you get protected from the variants or do you 100% get reinfected? [link] [comments]  |
| Any way to tell whether a vaccinated person was previously an asymptomatic COVID-19 carrier? Posted: 22 Jan 2021 06:29 PM PST Prior to the vaccine, I could have done antibody testing to see if I had been an asymptomatic carrier. Since there are so many long term effects (lung ds, brain ts changes), I can see it being useful knowledge down the road. I've now received one dose of vaccine; will we ever know if I was an asymptomatic carrier of COVID-19? Or has that ship sailed? [link] [comments]  |
| Is associative memory the same as episodic memory? Or is there a difference? Posted: 22 Jan 2021 03:07 PM PST Wikipedia says it's a declarative memory and episodically based. So I was just wondering if the two names are interchangeable, or they're distinct. [link] [comments]  |
| Why is it that alkanes have higher enthalpies of combustion? Posted: 22 Jan 2021 12:59 PM PST For pentane vs pentanol, for example, this is the complete combustion (balanced to have equal number of moles of pentanol and pentane): Pentanol: 2 C2H11OH (l) +15 O2 (g) → 10 CO2 (g)+ 12 H2O (g)+ energy Pentane: 2 C5H12 (l) + 16 O2 (g)→ 10 CO2 (g)+ 12 H2O (g)+ energy (Formula for enthalpy of combustion: bonds broken - bonds formed) (I think) So since the products are the same (bond formed), then the change is at the bonds broken. From my understanding, pentane (higher enthalpy of combustion) should have less energy "wasted" in breaking bonds, as pentane's reactants should have weaker (or less) bonds. However pentane's combustion has one extra O2 bond, so does that mean that pentanol's bonds are so much stronger (because of the OH) than pentane's to the point where even with the extra O2 molecule it takes more energy to break the bonds of pentanol's combustion rather than the bonds of pentanol's reaction? I know that there are also incomplete combustions, but my teacher told me that just by looking at the complete combustion I should see why pentane has a higher enthalpy. At least from my little understanding of chemistry that's the conclusion I reached but I'm not sure. Sorry for bad English, its not my first language and sometimes I express myself unclearly. [link] [comments]  |
| How does the upward force decide if an object floats or not? Posted: 22 Jan 2021 11:12 AM PST So if there's a box in let's say water, there is an upward force working up on it (archimedes principle). What my book doesn't explain, are the other pressures acting on the box. I know there's the atmoshperic pressure which is distributed through the water/liquid, but it's the same in all directions so we don't have to count it. Does the gravitational force also have an affect on if the box floats or not on the water? What happens if the gravitational force is greater than the upwards pressure and the other way around? [link] [comments]  |
| How much soil does a tree actually consume? Posted: 21 Jan 2021 05:36 PM PST My sister was complaining that she can gain a couple of pounds from eating a few ounces of fudge. I told her it's not just the fudge; food combines with water when stored as fat. I then thought a good example would be a tree that consumes very little soil, but still ends up weighing many tons from the air and water it consumes. So I would like to quantify that, but all my google searches about how much soil a tree consumes point me to articles about how much soil a tree needs to be planted in, but not how much it actually consumes. My question is, what percentage of its weight is from air and water? Does it use anything from the soil other than trace minerals dissolved in water, that amount to only a few pounds in a mature tree? [link] [comments]  |
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