Summary:: If BH do exist, could a sufficiently small mass attached to a sufficiently strong string be lowered past the Schwarzschild radius, and pulled back out?
If BH do exist (see https://arxiv.org/abs/1406.1525), could a sufficiently small mass attached to a sufficiently strong...
Thanks, Barakn! Of course the pressure required to collapse ordinary matter will not exist near the surface of a "neutron" star, so ordinary blackbody radiation will be emitted from the surface. I feel silly not to have realized that!
Not a homework assignment, relevant to designing springwater delivery and hydropower systems.
Thanks very much , Chester, for laying out the equations. I assume D is pipe inside diameter, g is acceleration of gravity, L length of pipe. I assume beta is incline angle of pipe..do you mean...
Chestermiller, your suggestion sounds like the right approach, but I am only familiar with the simplistic empirical equation I describe. Intuitively, since in the first example the force (pressure) available to push the water through the pipe is maximum at the inlet and zero at outlet, while in...
Since electromagnetic radiation is emitted as electrons decay from higher to lower states of excitation, I would assume that neutron stars cannot lose energy by blackbody radiation. That would leave tidal drag and evaporation as the only ways a neutron star can lose energy...True?
If you are twisting a helical spring, I believe the stress in the wire is essentially simple bending, not torsion. The wire of a helical spring subjected to compression parallel to its axis is stressed in torsion.
Flow delivered by a pipe can be calculated from input pressure, inlet geometry, pipe length, and a flow coefficient related to pipe cross-section, shape, and roughness. If we create an example of a pipe attached at the bottom of a self-refilling standpipe, which automatically supplies a...