Question

10 pts A sun-like star with mass M = 2.00 x 1030 kg and radius R = 7.0 x 10 km rotating once per month collapses into a neutron star (r = 16 km). What is the rotational speed of the sun-like star in rev/s? (1 month = 30 days, 1 year = 365 days, and 1 day = 86400 s.) 1.16x 10-S revis 2.74x 10 rev/s O 30.0 rev/s O 1.0 rev/s 0 0.03 revis 0 3.86 x 10-7 rev/s

Answer 1

i) It takes 1 month to complete 1 rotation ته ما 1 POV 1 moth 1 reu (30% 86400) 3.86X10~7 reuls (sinth option) ;) M. of Solid sphere MR2 5 M.I of Sun-like star= 2x2x10 30 5 x (7X108m)? 4-6 = 39.210 kgm² = 3.92 x 10 kg m? Csinth option) 4-7 Using conservation of Angular momentum I wis Is Wa =) First Izi Iz = 2(2x1030) (168108m) 5 = 2.048 810 38 Kg me

Now Wa- wi Il Ia 47 3.92 x 10 2.048 X1038 X 3.86810 7.388X102 Deu/ & 788 rouls (First option) ) Time period = ta L = liams (fifth option) 738