The mass enclosed in any orbit can be estimated from the equation M(<r) = v2r / G. If the quantity v is constant, regardless of radius, where is the mass located?
A) The mass is concentrated in the center.
B) The mass is spread out over large radius.
C) The mass is distributed like a doughnut, with a hole in the center.
D) Cannot be determined from the information given.
Correct Answer:
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