Which internal energy source produces heat by converting gravitational potential energy into thermal energy?
A) accretion
B) differentiation
C) radioactivity
D) both A and B
E) all of the above
D
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A _____ is a commonly accepted set of scientific ideas and assumptions
A) deferent B) paradigm C) theory D) hypothesis
the magnetic field increases in magnitude with time.
A. The induced current flows clockwise. B. The induced current flows counterclockwise. C. No current flows in the loop. D. A current flows, but one needs additional information to determine the direction in which it flows. E. One needs additional information to determine even whether a current flows or not.
If the value of H has not changed since the Big Bang, then H = 70 km/s/Mpc will give a Hubble Time of about 14 billion years
Indicate whether the statement is true or false
If WIMPs really exist and make up most of the dark matter in galaxies, which of the following is not one of their characteristics?
A) They travel at speeds close to the speed of light. B) They are subatomic particles. C) They can neither emit nor absorb light. D) They tend to orbit at large distances from the galactic center.