If the iron core of a collapsing star initially spins with a rotational frequency f0= 3.2 s–1 and if the cores radius decrease s during the collapse by a factor of 22.7, what is the rotational frequency of the iron core at the end of the collapse?
a) 10.4 kHz
b) 1.66 kHz
c) 65.3 kHz
d) 0.46 kHz
e) 5.2 kHz
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