Estimate the pressure in a 1.5 Mʘ neutron star with a radius of 15 km.
Estimate the pressure in a 1.5 Mʘ neutron star with a radius of 15 km.
If a neutron star has a radius of 15 km and rotates 1,382 times a second, what is the speed at which a point on the surface at the neutron star's equator is moving? Express your answer as a fraction of the speed of light. (Note: The speed of light is 3 ✕ 105 km/s.)
Astronomers observe a neutron star of radius 7.10 km and determine that it’s rotating at 21.9 rpm. If the stellar core that collapsed to form the neutron star was originally rotating with a period of 49.3 days, what was its radius?
Two identical probes are sent along the same path toward a neutron star. A neutron star is very dense, packing as much as 2 solar masses into a sphere with a radius on the order of 10 km. At the moment shown, the two probes are 57.5 km and 118 km away from the center of the neutron star, respectively. Find the distance between the center of mass of the two probe system and its center of gravity. Number km...
If a neutron star and a white dwarf has a total mass of 1M. If the white dwarf has a radius of 9 x 106 m and the neutron star has a radius of 11 km. i) Compare the surface gravity of both stars. ii) What is the density of the neutron star? iii) Assuming the neutron star is entirely made up of neutrons, and that the interparticle separation of a gas of density n is l = n-1/3. How...
A neutron star has a radius of 10 km and a mass of 1.4 Solar masses, what is its density and how does this compare to the nuclear density of 2.3 x 1017 kg/m3 (One solar mass is 1.988 x 1030 kg)
A neutron star has a radius of 10 km, and a temperature of 1 million K. What is its luminosity?
(Carroll and Ostlie, 16.16) (a) Determine the minimum rotation period for a 1.4 M. neutron star (the fastest it can spin without the centrifugal force being stronger than the gravitational force at the surface). Assume that the radius of the star is 10 km. (b) Use Newton's expression for the difference between Polar and Equatorial radii of a rotating object to estimate the flattening of a rotating neutron star (of course, it's a little harder in GR). The expression is...
A neutron star is a star that remains after a supernova, having a large enough density that the it is comprised of mostly neutrons and few protons. A pulsar is a neutron star that spins, radiating electromagnetic energy. We detect this energy as radio waves, noticing that they pulse at a rate of 1 kHz (1000 Hz). Let's assume that this rate corresponds to the rotations per second of the star (1000 rotations per second). Any solid sphere has a...
The mass of a certain neutron star is 2.0 x 1030 kg and its radius is 6,000 m (6 km). What is the acceleration of gravity at the surface of this condensed, burned out star? 3.71 x 10 -12 m/s2 2.17 x 1012 m/s2 3.71 x 1012 m/s2 0.53 x 1020 m/s2 5.30 x 1020 m/s2
To first approximation, a neutron star may be treated as a non-interacting gas of neutrons (spin-1/2 fermions). ( a) Find an expression for the degeneracy (zero point) energy of the star as a function its mass M and radius R. (Don’t worry that our calculation for degenerate Fermi systems was done for particles in a cubical box, the same results apply to a sphere of the same volume.) (b) Write down an expression for the gravitational potential energy of the...