Activity for spraff‭

Type	On...	Excerpt	Status	Date
Question	—	How fast can heat be carried away from a small source? Someone invents a portable, incredibly high-powered laser or similar energy weapon. The mechanism of energy production can be hand-waved away. In other words, it will heat up. Lots. Gigawatts lots, or terawatts/petawatts/etc. Handwave any production rate you like into this. Using only substances tha... (more)	—	almost 8 years ago
Question	—	Could a non-relativistic universe be logically consistent? As I understand it, the principle of relativity was accepted from Galileo until Maxwell, whereupon the equations which predict constant speed of light imply a preferred reference frame in a Euclidian space, suddenly making relativity testable. The Michelson"“Morley experiment showed that light speed... (more)	—	almost 10 years ago