Question

Assume a neutron star has a mass of about 1.2 times the mass of the Sun and a radius of 7 kilometers.

a) Calculate the average density of a neutron star, in kilograms per cubic centimeter.

b) If the escape speed is V2esc=2GM/R, work out the formula for the radius of the Event Horizon around a Black Hole of mass M.

c) Assume the Even Horizon is the size of the Black Hole. What is the density of a Black Hole that has the mass of the Sun?

d) What would be the mass of a Black Hole that has a diameter of 1 cm? Compare it to the mass of Mount Everest (about 5 x 1010 kg).

Answer #1

A white dwarf is a type of remnant star that will have about the
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One particular neutron star has a mass equal to 3.00 times the
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with a uniform density of 3.30×1017 kg/m3 !!
......compare that to the density of lead for example, at
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star runs out of hydrogen fuel and collapses at the end of its
life. The neutron star is a very dense and spins rapidly). If...

Consider a neutron star with a mass equal to 0.9 times the mass
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has a weight of 9.8 N on Earth. What would be its weight on the
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A typical white dwarf has a mass of about 1.0MSun and the radius
of Earth (about 6400 kilometers). Calculate the average density of
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answer using two significant figures.

A typical neutron star may have a mass equal to that of the Sun
but a radius of only 12 km. (a) What is the gravitational
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object be moving if it fell from rest through a distance of 1.5 m
on such a star? (Assume the star does not rotate.)

a) Your cosmic journey brought you into the vicinity of a
neutron star. In fact, you are orbiting this neutron star at an
orbital distance of 2,184 kilometers. The neutron star has mass of
1.6 solar masses (MSun = 1.99 × 1030
kg).
What is the local acceleration due to gravity that you experience
in your spaceship? Express your answer in m/s2; use
scientific notation and round the coefficient to two decimals.
b) What is the escape velocity from Earth’s...

Suppose a star the size of our Sun, but of mass 8.0 times as
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it were to undergo gravitational collapse to a neutron star of
radius 20 km, losing three quarters of its mass in the process,
what would its rotation speed be? Assume that the star is a uniform
sphere at all times and that the lost mass carries off no angular
momentum.
Answer in rev/day

Neutron Star Physics
Under some circumstances, an ordinary star can undergo
gravitational collapse into an extremely dense object made mostly
of neutrons. This type of star is called a "neutron star". A
neutron star has a mass density roughly 1014 times
larger than that of ordinary solid matter.
Suppose we represent an ordinary star as a uniform solid rigid
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Part A) No angular momentum
Part B) its proportional share three-quarters of the initial...

A planet has been discovered around a Sun-like star with an
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for the planet to maintain a hydrogen atmosphere for a significant
amount of time, the planet\'s temperature must be less than some
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kg and...

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