What centripetal force does an 60-kg passenger experience when seated 12 m from the center of a Ferris wheel that rotates once every 4p seconds?
a. 484 N
c. 914 N
b. 180 N
d. 240 N
B
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The observed relationship between the masses of central black holes and the bulge masses of galaxies implies that
A) galaxy formation and supermassive black hole formation must be related. B) the black hole will eventually suck in the rest of the galaxy. C) the biggest galaxies have the most luminous quasars. D) quasars were more common 10 billion years ago than they are today.
In general, a common magnet has
A) one pole. B) at least two poles. C) only two poles.
Stored potatoes, beets, and rutabagas in an unheated well-insulated room can be protected from freezing by having in the room
A) blocks of foam plastic. B) large tubs of water. C) an ample supply of fire wood. D) none of the above
Which of the following compounds would least likely act as an acid?
A) SO4-2 B) HSO4-1 C) H2SO4 D) NH3 E) CH3CO2H