The mass of a supermassive black hole thought to power a typical bright active galactic nucleus is roughly
A) 3 solar masses.
B) 10 solar masses.
C) 1 trillion solar masses.
D) 1 billion solar masses.
D
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Which of the following planets' average density is closest to that of Earth?
A) Mercury B) Mars C) Venus D) Neptune
Identify a true statement about carbonaceous chondrites
A) They contain significant amounts of helium. B) They contain abundant volatile compounds. C) They have been heated many times since their formation. D) They are the most-altered remains of the solar nebula.
A 0.28-kg stone you throw rises 34.3 m in the air. The impulse your hand receives from the stone while it throws the stone is
A.
s, up.B.
s, down.C.
s, up.D.
s, down.E.
s, up.A heat engine with an efficiency of 30% performs 2500 J of work. How much heat is discharged to the lower temperature reservoir?
A) 7100 J B) 8300 J C) 750 J D) 5800 J E) 1400 J