J.C.MacSwell

In thermal equilibrium and no other sources/storages of energy(not exactly the case but close approximation), we would be taking low entropy energy from the sun and outputing an equal amount of higher entropy energy into space. I guess that makes us a big (junk quality) photon producing machine!

You can be quoted word for word to a limited extent without your authorization. Credit (or discredit) should of course be given toyou as the author.

The assumption is that he swam 72m directly across the flow (I would not call this directly across the river but that is what they mean-directly across the flow of the river) at 0.75m/s but was carried 54m downstream during the time it took to traverse the 72m.

Your now was posted at only 9:32 PM (Nova Scotia/Atlantic time) Probably will stay up for the New Year though

I will use it to sleep in! (and some people claim there is no God!)

Makes sense. Same idea as the drag on a satellite making it speed up (as long as it stays in orbit). The friction losses from the tides etc. create heat which dissipates or is stored as thermal gain and the "efficient" part of the equation is stored as PE gain which is augmented by an equal PE gain from the loss of KE from the moon/Earth orbit. All paid for by a longer day!

Is the moon speeding up (decaying orbit) or slowing down?

The good news is, I have some more! The bad news is they only get worse!

Udderly rediculous! Dairy good! I hadn't herd that one.

Different fields.

No spin at all and the "terminator zone" should move about 1 degree every 24 hours.

On a cold winters day when we arrive home from work we could drag the hot engine core into our house to save on our furnace oil consumption. There are probably a lot of ways like this to save energy,

I guess that's the problem with the problem as stated. If you assume it is an introductory physics problem, strip away all the extraneous information, and take "surprisingly the elephant has no mass, please explain" to be code for ignore the elephant's mass then there is really nothing left to explain or solve. It is just a story about a flea walking away unharmed.

A reversed inelastic collision? Isn't there a law against that? I guess if you used pressurized air at ambient temperature it would ideally lose heat during an explosion/expansion so theoretically it could be done in a way that no net heat is gained or lost and entropy is increased.

There would be a net "anti-gravity" effect for all objects if the charge was greater (more negative charge) than the proton's (positive charge). There would be a net "extra gravity" effect for all objects if the charge was less (less negative charge) than the proton's (positive charge).

If you scaled everything exactly you would need 41% more takeoff speed. (square root of two times the takeoff speed)

I'm still not sure where the collision (or equivalent) is but isn't heat generated in inelastic collisions, but not elastic ones?

Isn't the electron-positron system the simpler case, and the "regular" ordinary atom the mystery?

We do!