Correct answer 0 00330547 s Explanation Given T 44 days 3 8016 10 6 s r i 7 8

Correct answer 0 00330547 s explanation given t 44

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Correct answer: 0 . 00330547 s. Explanation: Given : T = 44 days = 3 . 8016 × 10 6 s , r i = 7 . 8 × 10 5 km , and r f = 23 km , We will assume that during the collapse of the star, (1) no torque acts on it, (2) it remains spherical, (3) its mass remains constant. Since I is proportional to r 2 , and ω = 2 π T , conservation of angular momentum gives T f = T i parenleftbigg r f r i parenrightbigg 2 = (3 . 8016 × 10 6 s) parenleftbigg 23 km 7 . 8 × 10 5 km parenrightbigg 2 = 0 . 00330547 s .
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