Suppose that two objects collide. Which of the following things is not the same both before and after the collision?
A) the total momentum of the objects B) the total temperature of the objects
C) the total energy of the objects D) the total angular momentum of the objects
B
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Which of the following best explains the hypothesized phenomenon of black hole evaporation?
A) Particles (or anti-particles) are occasionally ejected from within the event horizon, causing the black hole to lose mass. B) Virtual particles created near the black hole are constantly annihilating each other, causing a very high temperature even if the black hole has no accretion disk. This high temperature provides escape velocity for the virtual particles, causing the entire "cloud" of virtual particles to expand away into space. C) Particles (or anti-particles) are created by a quantum mechanical effect near, but outside, the event horizon of the black hole. The law of conservation of energy maintains that the black hole must lose energy to "pay" for the creation of this mass. D) Black hole evaporation is a virtual process, meaning that it has been theorized by astrophysicists, but doesn't really occur.
The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
A. D. B. E. C. F. D. G. E. H.
When water boils, its temperature __________
Fill in the blank(s) with correct word
If the average kinetic energy of a volume of ideal gas increases, what must be true?
A. the density decreases B. the pressure increases while the temperature stays the same C. the temperature increases while the pressure stays the same D. both the pressure and temperature increase