What is Hawking radiation?
A) a type of high-energy radiation that comes from inside a black hole's event horizon
B) a type of radiation coming from objects supported by degeneracy pressure
C) a hypothesized way for black holes to gradually shrink in mass
D) a type of radiation that we have detected so far only with infrared telescopes in space
C
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A solid cylindrical bar conducts heat at a rate of 25 W from a hot to a cold reservoir under steady state conditions
If both the length and the diameter of this bar are doubled, the rate at which it will conduct heat between these reservoirs will be A) 200 W B) 100 W C) 50 W D) 25 W E) 12.5 W
Collisions in which kinetic energy is conserved are said to be ineleatic collisions
Indicate whether the statement is true or false
Consider a solid sphere of radius R and mass M rolling without slipping. Which form of kinetic energy is larger, translational or rotational?
A) Translational kinetic energy is larger. B) Rotational kinetic energy is larger. C) Both are equal. D) You need to know the speed of the sphere to tell. E) You need to know the acceleration of the sphere to tell.
Regarding Ptolemy's and Copernicus's theories of astronomy, today we find that
A) both theories are useless because they disagree with the highly accurate measurements available today. B) Copernicus's theory is correct. C) Copernicus's theory is still useful, but more accurate theories are available today. D) both theories are false because we know that Kepler's theory is correct and precisely accurate. E) Ptolemy's theory is correct.