As the ISS grew over time, it’s center of mass must have changed location. How did their thrusters change their behavior or were they literally moved to a new location? |
- As the ISS grew over time, it’s center of mass must have changed location. How did their thrusters change their behavior or were they literally moved to a new location?
- Do any plant cells undergo apoptosis in a similar fashion to animal cells?
- Why can't HIV be spread by vectors?
- Why do some vaccines only need to be given once, while others such as the flu jab need to be done yearly?
- What is actually celiac disease?
- How can foods labeled "Refrigerate after opening" stay on a shelf for extended periods of time without spoiling but then must be refrigerated after opening to prevent spoiling?
- What changes the size of rain droplets?
- Reflected light from a colored object?
- Molecularly, how exactly do carcinogens cause cancer?
- Have any lab created elements been discovered in meteorites or other extra terrestrial samples?
- Are the armpits of animals, like monkeys for example, same as human pits? As in it sweats, smells there more?
- When you feel full after eating, is it because your stomach is literally not able to fit more food or is it just your brain telling you to stop eating?
- Density of Plasma/Amount of Fusion in a Fusion Reactor?
- Why is the blood of horseshoe crabs blue?
- Do ACE inhibitors lower blood CO2 levels?
- Why is decreasing a parcel of air's temperature down to its wet bulb temperature considered to be an isenthalpic process?
- If you rip / cut off the leaves from a plant, do the cells inside die instantaneously ?
| Posted: 05 May 2019 11:21 AM PDT |
| Do any plant cells undergo apoptosis in a similar fashion to animal cells? Posted: 05 May 2019 01:47 PM PDT |
| Why can't HIV be spread by vectors? Posted: 05 May 2019 01:30 PM PDT |
| Posted: 05 May 2019 03:45 PM PDT |
| What is actually celiac disease? Posted: 05 May 2019 11:16 AM PDT Is it an intolerance? Or an allergy? Which kind of immunoglobulins does it involve - or, generally, how does it affect the immune system? Which are the causes? And is there any possible treatment? [link] [comments]  |
| Posted: 05 May 2019 10:34 AM PDT |
| What changes the size of rain droplets? Posted: 05 May 2019 09:59 PM PDT I noticed the other day that sometimes when it rains, it rains tiny little pitter patter raindrops, but other times there huge globs of water. Why is that. [link] [comments]  |
| Reflected light from a colored object? Posted: 05 May 2019 12:35 PM PDT From my understanding, when I shine a white light on a green object the atoms electrons 'absorb' the energy as the light has the same resonant frequency as the electrons which allows for the max amount of energy transfer. This means that the colors(wavelengths) other than green are absorbed the most while the green light is reflected.(If this is wrong please correct me) My question is, by what mechanism is the green light reflected from the object, is it reflected by the electric field of the atom? Is it absorbed and re-emitted? Does it undergo some sort of scattering, if so what one? [link] [comments]  |
| Molecularly, how exactly do carcinogens cause cancer? Posted: 05 May 2019 07:00 PM PDT |
| Have any lab created elements been discovered in meteorites or other extra terrestrial samples? Posted: 05 May 2019 07:52 AM PDT |
| Posted: 05 May 2019 03:42 PM PDT |
| Posted: 05 May 2019 02:34 AM PDT |
| Density of Plasma/Amount of Fusion in a Fusion Reactor? Posted: 05 May 2019 01:54 PM PDT At the ITER website (https://www.iter.org/mach), talking of their tokamak reactor, it says:
At the 'Do The Math' website (https://dothemath.ucsd.edu/2012/01/nuclear-fusion/), talking of fusion power, it says:
Lithium's density is 0.534 g/cm3, which means that a volume of 840m³ would hold about 450 metric tons of it, roughly 1/3 of the total needed to power the entire world. Presumably the plasma version weighs a lot less, and also it's not fusing at a rate of 100%. What I'm curious about is (a) how much less, and (b) of that total, when the fusion reactor is running, how much is actually going to be fusing at any one time? 1%? 0.00001? The fusion reactor, as I understand it, is supposed to squeeze the plasma and heat it up until fusion starts, which excess heat you use to boil water and turn turbines. That means there's going to be 840m³ of really hot plasma, but not all of it's going to be fusing. If the magnets fail, how quickly does the plasma cool off? What's to stop it contacting the sides of the reactor and melting them, or even burning through to where the water is and causing a steam explosion? [link] [comments]  |
| Why is the blood of horseshoe crabs blue? Posted: 05 May 2019 07:50 PM PDT |
| Do ACE inhibitors lower blood CO2 levels? Posted: 05 May 2019 07:45 AM PDT |
| Posted: 05 May 2019 06:47 AM PDT Explanations online say that all heat lost by the air is gained by the water, which evaporates and becomes part of the air, so the heat lost is canceled out. I get that, but isn't there some enthalpy contained by the water before it evaporates that needs to be accounted for? So let's say the air is originally completely dry and has an enthalpy of H_a, a mass of m_a, and a specific enthalpy of h_a (H_a/m_a). The unevaporated water initially has an enthalpy of H_w, a mass of m_w, and a specific enthalpy of h_w (H_w/m_w). Now let's say the water is evaporated into the air until it reaches its wet bulb temperature. After the evaporation, the air would have an enthalpy of H_a - Q and the evaporated water would have an enthalpy of H_w + Q, where Q is the heat transfer. Putting this all together, the final enthalpy of the fully saturated air would have an enthalpy of H_a - Q + H_w + Q = H_a + H_w and a specific enthalpy of (H_a + H_w)/(m_a + m_w), which are not equal to the initial enthalpy of specific enthalpy. What am I missing here? [link] [comments]  |
| If you rip / cut off the leaves from a plant, do the cells inside die instantaneously ? Posted: 05 May 2019 03:19 AM PDT Obviously the plant doesn't function as before, but what exactly happens to the individual cells, in terms of biology? [link] [comments]  |
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