Exercise 9: Black holes are suspected when a visible star is being noticeably pulled by an
invisible partner that is more than 3 times as massive as the sun. a) If a red
giant (a dying star) is gravitationally accelerated at 0.075 m/s2 toward an
object that is 9.4 x 1010 m away, how large a mass must the unseen body
possess? b) How many times more massive is the object than the sun?
(Mg = 1.99 % 1030 kg)
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