In active galaxies, their central engines may be temporarily fed ...

[stock]

In active galaxies, their central engines may be temporarily fed by
 
  A) a sudden surge of star formation.
  B) a series of supernovae around the core.
  C) the sudden collapse of the core into a supermassive black hole.
  D) a close encounter with a neighbor galaxy.
  E) the fusion of helium into carbon in their cores.

Question 2

Considering Einstein's famous equation, E = mc2, which of the following statements is true?
 
  A) Mass can be turned into energy, but energy cannot be turned back into mass.
  B) It takes a large amount of mass to produce a small amount of energy.
  C) A small amount of mass can be turned into a large amount of energy.
  D) You can make mass into energy if you can accelerate the mass to the speed of light.
  E) One kilogram of mass represents 1 joule of energy.

[Sammyo]

Answer to Question 1

D

Answer to Question 2

C

[stock]

Thanks

[Sammyo]

Welcome