Harry Veeder wrote. > > Frederick Sparber wrote: > > > Interesting reading Harry. > > But you can bring a bucket of minus 77 K cold Tc from a > > comet in space and let it do work in compliance with the > > Carnot efficiency by letting it warm to 300 K Th > > ( room temperature) using an "engine". > > > > Carnot efficiency = .1 - Tc/Th or delta T/Th. = 74.33 % > > > > This is correct if you are only considering the work produced after you have > the ice. However, will more work be produced than used in retrieving the ice > from the comet? The second law says no. > The 1908 Tunguska Event says yes.
http://www.galisteo.com/tunguska/docs/splitsky.html "Some have suggested it was a black hole. Others have wondered if it was a piece of anti-matter. A Japanese UFO group (Sakura), headed by Kozo Kowai, are convinced that it was the explosion of the nuclear power plant of an errant vehicle belonging to extraterrestrials. A number of science-fiction accounts have degraded the event to fantasy. Some critics hold that the entire history of nearly five decades of field work represents little more than a chain of mistakes. Most scientists disagree and point to a comet or an asteroid being the cosmic culprit." It's mass and velocity were estimated from it's energy release. Fred > > Harry > > Fred > >
