Activity for James McLellan‭

Type	On...	Excerpt	Status	Date
Question	—	What are the Names of the Earth-Sun L4 and L5 Regions? The Earth-Moon Lagrange points have names: L1, L2, and L3 are Libration Points, the L4 and L5 points are the Kordylewski Clouds. The Jupiter-Sun L4 is named the Greeks, and the Jupiter-Sun L5 is named the Trojans. What are the names of the Earth-Sun L4 and L5? (more)	—	12 months ago
Question	—	Does 5th Gas Giant Have a Name? I recently learned that it's believed that the solar system once had one more gas giant, which was ejected by Jupiter some time in the past. https://thesolarsystem.fandom.com/wiki/FifthGiant Does anyone know if this hypothetical planet has a name? (more)	—	12 months ago
Question	—	What are Some House Games for Free Fall? Living in space can be boring. What are some good home games for people living and working in free fall? I thought of a few - - Bocce : in this variant the size of the jack and the player balls is swapped. The jack is large, massive, and magnetic. Play begins by letting the jack free float in s... (more)	—	over 1 year ago
Answer	—	A: How can a Type II civilization influence accretion rates from a debris disk to a passing star? Kepler's Laws give us the velocity of everything in the debris field and comet cloud-- At any radius, $i$, the velocity of the circular orbits (and a good rough definition of a "belt", although this is excluding highly elliptical objects) -- $ v{b,i} = \sqrt{{{GM{b}} \over {R{b,i}}}} $ Where $v... (more)	—	over 1 year ago
Question	—	Considerations for Recreational Solar Sailing? I was investigating a few ideas on recreational solar sailing, and came up with some interesting things - The primary equation in solar sailing is $ F = {{2 R S A} \over {c}} \sin^2{\theta} $ Where - R is the fraction of incident light - S is the solar flux being received (Watts per meter ... (more)	—	over 1 year ago
Question	—	How Could Golf Change in a Low-Gravity Environment? Low gravity golf was invented by Alan Shepard in 1971 when he hit two golf balls 40 yards on the moon. Surprisingly, this version of the sport with little atmosphere and much lower gravity, is the most common that will be played on the planets in the solar system that are already top candidates fo... (more)	—	over 1 year ago
Answer	—	A: Electricity from nuclear decay According to this site, the kinetic energy of the two alpha particles emitted is 4.273 MeV. As you said, these aren't neutral atoms yet with balancing electrons. So, they are a charged plasma. Imagining, instead of a shielded lump, that you had your sample crushed fine on a dish, (so that the h... (more)	—	over 1 year ago
Question	—	Is Scientific Speculation the Right Place for a Discussion Series About Space Sports? I feel like science fiction doesn't have many sports, other than the occasional laser battle or fantasy sword duel. I'd like to start a discussion series about sports in a low-gravity/no-gravity environment. Not necessarily a single question with a single answer. I started with a question about wr... (more)	—	over 1 year ago
Answer	—	A: How would an interstellar spaceship's speedometer work if everything else is moving? I'd recommend a Kalman filter to increase measurement accuracy to the overlap of multiple system errors so that you get the best result. For inputs, may I recommend - - a calculation of doppler shift for known stars. You can do this realtime. Take a fast fourier transform of the incoming light ... (more)	—	over 1 year ago
Answer	—	A: A hair product which is both a lipid ointment and a gel Yes. Although this may be streching your definition of oil a bit. The oil product could host some sort of microfauna that cure the product by building EPS microstructures. https://en.m.wikipedia.org/wiki/Extracellularpolymericsubstance (more)	—	over 1 year ago
Question	—	How Would the Sport of Wrestling Change in a Microgravity Environment? How would competitive wrestling change in a microgravity environment? (more)	—	over 1 year ago
Question	—	Meaning of Non-Locality? Theory ### If I am understanding this history of this correctly, in the 1920s the mathematical process of converting measurements with a certain amount of measurement error into numbers, then doing your calculation, wasn't doing a very good job of predicting the experimental outcomes of nuclear ch... (more)	—	over 1 year ago
Question	—	Discussion of Aerogel Orbital Rings Orbital rings are a proposed megastructure intended to dramatically reduce the cost to enter or exit a planetary gravity well. The ring is a solid structure, belting around the planet like a hula hoop. Because it is solid, any loss of gravitational potential energy (falling) on one side would be ... (more)	—	over 1 year ago
Question	—	What Would a Femtometer Scale Utility Fog Be Useful For? Utility fog is a swarm robotics concept in which a mesh of robots barely larger than a grain of pollen (5 micrometer ( $10^{-6} $ m ) bodies and 50 micrometer arms) are dodecahedrons (12 sided polygons) ending in telescoping arms (12 of them) ending in grabbers. The concept is that the tiny robo... (more)	—	over 1 year ago
Answer	—	A: PVA glue curing process Looks like it may just be mechanical. According to this article, if true, you can rehydrate white glue with water and heat. https://simpleglue.com/how-to-revive-elmers-glue/ (more)	—	over 1 year ago
Question	—	Price's Law Sanity Check Price's Law is a hypothesis that in an organization, or across an industry, roughly half the productive output is being generated by a number of people equal to the square root of those participating in the activity. For a classic example: in a business of 100 people, half of the output can be traced... (more)	—	over 1 year ago
Question	—	What are the Ground Effects of the South Atlantic Anomaly? Picture of Earth's Magnetic Field, with South Atlantic Anomaly over Continental South America Hilighted I was recently introduced to the South Atlantic Anomaly. As I understand, for satellites and space craft, this is a natural feature that can wreck space craft by taking even computers designed f... (more)	—	almost 2 years ago
Answer	—	A: How can we grow this community? Under "Making a Good First Impression", a few mechanical notes from someone just making the transition from WB.SE to Codidact - Question titles should probably be at the top of the page, instead of the bottom Login from another community (for example writing.codidact.com) does not work - I mu... (more)	—	almost 2 years ago
Answer	—	A: How can we grow this community? Advertise on Gab Gab.com is an environment where very little advertising is happening (so what you spend will be visible), and the audience is almost completely people actively looking for alternatives to the products they are currently using. They claim 15 million unique visitors per month ... (more)	—	almost 2 years ago
Answer	—	A: High-Energy Exhaust Shielding for Far-Future Drive You have mass flow rate and velocity, but the area this is spread over will say a lot - $$\dot{m} v = F = 1 {{kg} \over {s}} \cdot 1,000 {{km} \over {s}} \cdot 1,000 {{m}\over{km}}= 1 \times 10^{6} N $$ If your engine design spreads this over a 2 meter (6.6 ft) diameter (1 m radius), you'd have... (more)	—	almost 2 years ago