Everything posted by Sensei
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To collect as wide as possible solar energy spectrum ?
Dyson sphere.. https://en.wikipedia.org/wiki/Dyson_sphere The efficiency of the solar collector is 75%. e.g. instead of heating water with gas or electricity, you can have hot water for bathing or showering without energy costs.. but you have to take a bath at the right time of the day, not at any time.
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War Games: Russia Takes Ukraine, China Takes Taiwan. US Response?
Not really.. "God's will" The destruction of the pipe makes it impossible to blackmail Europe by closing it and reconnecting it, at will.. so, it is gone, for real.. "God's will"
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Origin of precious metals...
@paulsutton"This periodic table depicts the primary source on Earth (...)" ... Helium on Earth is formed by radioactive decay, alpha decay..
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"Rigid airship" using low density hydrogen(LDH)
..and I was talking about you making measurement of volume, thus indirectly measurement of mass, which you can gain using your technology.. If an engineer has a device made of, say, iron, with a density of 7.87 g/cm^3, and changes it to a magnesium-aluminum alloy, with a density between 1.74 g/cm^3 to 2.7 g/cm^3, he will immediately gain 3-4 times, for example, the device mass will drop from 1,000 kg to 220-290 kg. Show how much you can gain using your technology.. The air between the elements will weigh more..
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War Games: Russia Takes Ukraine, China Takes Taiwan. US Response?
@StringJunkyUS military, politicians and media, use the word "neutralization" instead of "murder"
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"Rigid airship" using low density hydrogen(LDH)
Air has density ~ 1.29 g/L, Hydrogen has density ~ 0.09 g/L, Helium has density ~ 0.18 g/L. i.e. they are all >> 1000 times less dense than regular solid matter. Magnesium (the lightest structural metal) has density ~ 1738 g/L, Aluminium has density ~ 2700 g/L, and other metals even more.. Mg-Al alloys are used in engineering where low weight is recommended. How much volume do you want to convert from air to Hydrogen and possibly to vacuum? Try to calculate this based on the size of the device.. Multiply by above numbers and you will calculate possible gain.. and rethink if it is all worth it. IOW, what is so revolutionary about making balloon or airship?
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Are compounds of Radioactive Isotopes - radioactive?
Gamma photon(s) can be emitted by the nucleus, and X-rays and UV photon(s) can be emitted by electrons transitioning to the ground state of the daughter isotope. The 1s orbital is vacant, so further electrons will have to decay via photon emission to reach their final states.
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Are compounds of Radioactive Isotopes - radioactive?
Sometimes this is the case. If the exclusive mode of decay is electron capture, then a fully ionized atom cannot decay because there are no electrons in the shell(s). Beryllium-7 is an example of an isotope that has a slightly different half-life when metallic than in compounds. https://www.google.com/search?q=Beryllium-7+half+life+change
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War Games: Russia Takes Ukraine, China Takes Taiwan. US Response?
If the Russians send new soldiers (>= 300,000) to Ukraine, it's high time to close all borders, with literally everything.. forever.. destroy bridges, just in case, etc.
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What if galactose was the size of a galaxy?
Mods, please, rename user account to "galactosedestroyer"..
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Gallons/Quarts
Make a document, print it out, and place in toilet in visible place from WC..
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Weight and Mass unit Conversion
Google does the conversion, you don't have to visit any website.
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Temperature conversion
Google does the conversion, you don't have to visit any website.
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Temperature conversion
Google can do that. https://www.google.com/search?q=100+celsius+to+fahrenheit It works with other physical units or currencies, etc. ..this way you can learn something.... Make Excel/Open Office Spreadsheet once, and then you can use it forever.
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War Games: Russia Takes Ukraine, China Takes Taiwan. US Response?
...and these are who are not so easy target for propaganda and lies..
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War Games: Russia Takes Ukraine, China Takes Taiwan. US Response?
At least 50,000 of them were IT software engineers. https://en.wikipedia.org/wiki/Russian_emigration_following_the_2022_invasion_of_Ukraine "Those who have fled tend to be young and well-educated professionals, leading some economists to suggest that the Russian brain drain is worsening.[24] More than 50,000 Russian information technology specialists have left Russia.[25]" "to the poor only the wind blows in their eyes"..
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War Games: Russia Takes Ukraine, China Takes Taiwan. US Response?
Those who were wise fled the country on February 24..
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War Games: Russia Takes Ukraine, China Takes Taiwan. US Response?
Russians' worst enemy is other Russian. They have adage: "у нас много людей" ("we have a lot of (dispensable) people")
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What is the worst possible consequence of eating dirty food?
People searching for food in garbage bins do not have mental illnesses. They are homeless, hungry without cash or freegans.. If this is a problem, don't eat in restaurants.. When customers too often have diarrhea after dining at a restaurant, they remember it and stop going there, and such a place is on a straight line to bankruptcy. It is in the restaurateur's interest to ensure that the food is of the best possible quality, so that customers return and praise the stay, rather than discourage their friends and family.
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Does darkness exist ?
Photons are emitted by some material, for example, as a result of the temperature of an object (thermal emission). When they hit some material, they can be 1) absorbed 2) reflected 3) refracted. The chemical and physical properties determine at what frequency/wavelength/energy of the photon this will occur. Material may be transparent at one pressure and temperature and opaque at other conditions. We see things around us when photons are reflected by an object toward us and the eye absorbs the photons, causing an electrical impulse to be sent to the brain to decode what we see. The lack of photons in the visible range of the spectrum does not mean that we cannot "see"/detect objects, e.g. radar does this at different frequencies than our eyes.
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here yuo canion without any doubt
Perpetual motion on Earth will be slowed over time by 1) friction between an object in motion and air particles 2) gravity.
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What is the correct way to use a science based forum ?
Science is experimentally proven knowledge gathered over hundreds and thousands of years of human development. If the thread is closed, you are most likely making up things that are not mainstream science and/or even contradict common knowledge.
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what are the names of 2 solids that combust when they come into contact
You didn't mention what pressures and temperatures have to have these solids.. What at STP is gas, at low enough temperature and/or pressure can be solid i.e. one can have a piece of solid Chlorine (below −101.5 °C) or other stuff.. Alkali metals and ice? They release hydrogen, which, when in contact with Oxygen from the air, can ignite:
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The meaning of genetic novelty
Random mutation. First seen just because it has just appeared in your lifetime. e.g. resistance to drugs that have just been made by human.
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voting for a president or leave a like on youtube : how do we call this phenomenon ?
YouTube and other websites sort content by the number of likes. The most liked content is shown first, so youtubers ask their users to like the video and subscribe to the channel. There may be other rewards for the most liked content, such as higher ad rates.