Two hockey pucks are initially at rest on a horizontal plane of frictionless ice. Puck A has twice the mass of puck B. Suppose we apply the same constant force on each puck for the same interval of time dt. How do the puck’s kinetic energies compare at the end of the interval?
A. KA = 4KB
B. KA = 2KB
C. KA = KB
D. KB = 2KA
E. KB = 4KA
F. Some other relationship (specify)
D. KB = 2KA
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Gas falling into a black hole:
a. is heated to millions of degrees through the loss of gravitational energy b. is cooled to near absolute zero through the loss of gravitational energy c. releases energy, all of which is absorbed by the black hole d. never reaches the black hole due to the effect of time dilation e. orbits the black hole but cannot cross the event horizon
Which of the following best describes what we mean by a habitable world?
A) a planet or moon that could support life, if any life happened to be on it B) a planet or moon with life C) a planet or moon that lies within its star's habitable zone D) a planet or moon on which humans could survive if we happened to go there
Superconducting electromagnets
A) account for cases of magnetic levitation. B) are characterized by easy penetration of external magnetic fields. C) both of these D) none of the above
Which ancient astronomer recorded the magnitude of stars in his star catalog and was used successfully by astronomers for generations?
a. Ptolemy b. Copernicus c. Galileo d. Kepler e. Aristotle