A billion solar mass black hole has a radius of only:
A) one solar diameter.
B) 20 A.U.
C) 400 A.U.
D) 3 parsecs.
E) 20 parsecs.
B
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A 72-kg man is standing in a 20-kg boat. The man steps to the right thinking he is stepping out onto the dock. However, the following will actually happen (ignore the friction of the water or air on the boat or the man):
100 coins, each with a Head and a Tail, are tossed randomly onto a table. A microstate is defined as the number of Heads that appear after the toss. What is the value for the number of Heads that has the most number of microstates?
A. 95 B. 75 C. 60 D. 50
Active galaxy is a galaxy:
A) whose center emits large amounts of excess energy. B) whose center does not have a black hole. C) that is in the process of merging with another galaxy. D) that manifests a blueshift instead of a redshift.
An iron nail is brought near a magnet. Which of these is not true?
a. The nail has a north pole and a south pole. b. The nail becomes a north pole or a south pole. c. The magnet exerts an attractive force on the nail. d. The nail exerts an attractive force on the magnet. e. The nail is ferromagnetic.