Neutron considered as giant nuclei and can be well described by the fermi gas model for nucleus. if the mass of a neutron star is m 3x100kg, obtain its radius. assume a constant mass density and utron stars consist entirely of neutrons (neglecting the surface layer of atoms). they can be average potential energy per neutron due to the gravitational pull as: 5r , where m, s n, g and r are the neutron mass, neutron number, gravitational constant and star radius, respectively. all the required constants can be found in the literature. hint: the star is in equilibrium when its total energy, consisting of potential energy of gravitational pull and kinetic energy of neutrons in fermi gas model, is minimised.

28. evolution

29. environment, survive, offspring  

explanation:

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

the answer is the index of refraction of the second medium is higher. i just took the test.