I have the 1989 Melosh book, Impact Cratering, and it's an excellent book with one exception: it talks about the Tillotson EoS, and it details it a bit in an appendix, but it seems to leave something out. I was hoping someone here could help me to understand it.
The book gives the equation...
I'm trying to find how much iron (by mass) is in the main asteroid belt. I'm finding a lot of sites that say 10% of the asteroids are M class, but is that by number or by mass? Does anyone know, and can you provide a reference?
Alright, let's assume the volume of air in question is saturated by steam rising off a boiling pot of water. Let's say the air is 0.1 x 0.1 x 0.01 m, or 10^-4 m^3, it's 100 degrees C, and it has a density of 58g/m^3. The ideal gas equation gives its initial pressure as about 100 mBars. If the...
It seems to me the rising would be the easier one to figure out. I know some people haven't liked the description of hot air rising as a result of buoyancy, but considering that as an approximation, I can see the buoyant force decreasing as the body of air rises and/or changes (cools, diffuses...
I know there have been some forums here about hot air rising, but I'm curious - how fast does hot air rise? Also, how fast does it disperse? If we consider steam, for example, rising and dispersing horizontally from a boiling pot of water. Does anyone know some (hopefully simple) equations to...
I was wondering - when pressure is applied to solids, do they heat up? Not pressure like an impact - I'm not talking about conversion of kinetic energy. But suppose a piece of iron is put in a hydraulic press and the pressure increases slowly. More specifically, I'm wondering about the rocks...
I was wondering - when pressure is applied to solids, do they heat up? Not pressure like an impact - I'm not talking about conversion of kinetic energy. But suppose a piece of iron is put in a hydraulic press and the pressure increases slowly. More specifically, I'm wondering about the rocks...
The law of entropy only applies to a closed system, which the Earth is not. We have energy input from the sun, which powers photosynthesis in plants, allowing them to build and store nutrients that humans consume, fueling our engineering endeavors. So a decrease in usable energy in the sun...
That's what I said. "The 10 pounds of force gets transferred to the tip of the nail ..."
Sometimes it does. Again, consider your feet. If I weigh 75 kg, and gravity accelerates me at 9.8 m/s^2, I apply a force against the floor of 735 N. If each shoe has an area of 0.015 m^2, the...
Force can change when you're applying a constant pressure. An example of this is the hydraulic lift. But you can also apply a constant force, which would mean pressure does change with the area. An example of this would be the pressure applied by your shoes as you stand on one foot or two -...
Multiplying pressure is nothing unusual. Pressure is equal to force divided by area. Reduce the area and you increase the pressure. Think of a hammer and nail. You apply, let's say, 10 pounds of force to the head of the nail, which has an area of, let's say, 1/10 of a square inch. That...
I was thinking about the pressure build up in a system that is squeezed equally from all sides (or at least in two dimensions, like squeezing a tube of toothpaste), and I ran into a conundrum. If the pressure increases as the area decreases, then the pressure inside a circle that's squeezed...