Question

1)A star with the mass (M=2.0

Answer 1

Part A

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initial ang mom = final ang mom

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    mom of inertia * ang speed = mom of inertia * ang speed

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      (2/5) m R² * 2? / T    =     (2/5)m r² * 2? / t

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         R² t / T   = r²

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   r = 3.5 x 10⁸ * (0.200 /29*86400)^1/2    =   98884 meters =    98.88 km   is theradius

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Part B

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        speed = distance /time = 2?r / t = 2? * 98884 /0.200 =    3.106 x 10⁶ m/s