Author Question: When mass is accreted into a black hole, how much total mass-energy can be radiated away? A) .007 ... (Read 53 times)

APUS57 · **on:** Jul 27, 2018

When mass is accreted into a black hole, how much total mass-energy can be radiated away?

A) .007
B) .08
C) 1.4
D) 20
E) 50

Question 2

Close binary star systems are thought to form when

A) two interstellar gas clouds happen to contract so close together that there's no room for a disk or planets.
B) the protostellar disk around a protostar has enough material to form a second star.
C) gravity pulls two neighboring protostars quite close together, but angular momentum causes them to orbit each other rather than colliding.
D) a protostar emits two jets, each of which turns into a star.