Assume that the mass of the core of a star that just went Supernova type II is 2.5 MO before and after the collapse, while the Radius changes from 103 km, before the collapse, to 12 km, after the collapse respectively. (a) What is the change in potential energy of the core between the two stages before and after the collapse? (b) Knowing that the luminosity of the Sun is 4 × 1026 W how many years would it take the Sun to release the same amount of energy?|

Assume that the mass of the core of a star that just went Supernova type II is 2.5 MO before and after the collapse, while the Radius changes from 103 km, before the collapse, to 12 km, after the collapse respectively. (a) What is the change in potential energy of the core between the two stages before and after the collapse? (b) Knowing that the luminosity of the Sun is 4 × 1026 W how many years would it take the Sun to release the same amount of energy?|

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