Recent content by magneticanomaly

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...

How exactly does a mass of neutrons emit EMR? I thought this emission was from compression of non-degenerate matter as it falls into the neutron star.

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...