Question

The mass of a certain neutron star is 1.2 × 1031 kg (6 solar masses) and its radius is 5000 m. what is the acceleration of gravity at the surface of this condensed, burned-out star

Answer 1

By definition we have that gravity is defined as:
g = G * M / r ^ 2
Where,
M = Mass
r = radius
G = 6.67 * 10 ^ -11 Nm ^ 2 / kg ^ 2
Substituting the values we have:
g = (6.67 * 10 ^ -11) * (1.2 * 10 ^ 31) / (5000) ^ 2
g = 3.2016E + 13 m / s ^ 2
Answer:
the acceleration of gravity at the surface of this condensed, burned-out star is
g = 3.2016E + 13 m / s ^ 2