Recent content by Malapine

Would it be plausible to have two gas giants orbiting each other, a few million km apart, with a terrestrial planet at their mutual L4 or L5 point so that they both appear as visible disks fixed in the sky? Or would the terrestrial planet not be stable there and end up ejected?

(4) The Time Machine is just a framing device for social commentary on inequality between workers and aristocrats and does not need to be physically rigorous.

If I am understanding the following correctly, Kimberlite Volcanology: Transport, Ascent, and Eruption J. Kelly Russell, R. Stephen J. Sparks, and Janine L. Kavanagh https://livrepository.liverpool.ac.uk/3066251/1/Final_Elements_Manuscript_w_Figs_Nov6_2019.pdf then roughly 0.2 km3 of rock...

Are there any thoughts on what effects a Kimberlite eruption would have on nearby populations, if one occurred in modern history? They were supposedly quite violent based on the estimated rates of ascent of the diamond-bearing lava, but how does that translate to VEI or megatons, etc. ? [...

Because the farmers that can track this stuff in their heads will have a competitive advantage, getting more acres harvested with less wasted motion, losing less produce to wiltrot, and always showing up at the marketplace a few decableems before you to stake out the best spot.

Even without a growing cycle, farmers need to track how long it will take to plant or harvest an acre of vegetables, how long it takes them to mature, how long until the harvested produce spoils and cannot be sold, how long it takes to haul a wagonload to the town market, when the next market...

A standard 1300cc/hour fuel injector from an auto parts store, if that would work.

Solenoid fuel injector, if you can have a pressurized reservoir of more than 1-2 ml and just need to control the volume that is dispensed ?

If the portal does conserve energy, then shoving an object of mass m "uphill" from an energy-conserving Earth portal to a Moon portal would require: (GmM🜨/R🜨) - (GmM☽︎/R☽︎) Or about 6×10^7 J/kg, presumably supplied using some sort of hydraulic jack over an extended period of time. Dropping an...

You can't know what m is in that situation: you would have to apply a known force to it and measure the acceleration.

For story purposes, I want a portal from the Earth to a sealed cave on the Moon. But how would gravity behave near such a portal? A test mass on the moon end feels 1.6m/s^2 acceleration towards the center of the Moon, a test mass on the Earth end feels 9.8m/s^2 acceleration towards the center...

Would there be any decrease in temperature or pressure upstream from the orifice? I am assuming some sort of tornado-like vortex forms in the area above the breach, but if there is no pressure or temperature drop, then there won't be a visible condensation funnel (or no funnel at all, just...

So: frictional heating of normal air flowing through the orifice will prevent it from cooling to crygenic temperatures as it expands into the vacuum, and the hull breach won't seal itself with a block of frozen air.

Steady flow through an orifice, from an unlimited reservoir of STP air (for example an extremely large space habitat) into an unlimited vaccum.

Could air escaping through a narrow opening into a vacuum freeze due to cooling from Joule-Thomson expansion, and cause frozen N2/O2 to accumulate around the edges of the opening until it clogged shut ?