What is the radius of a star whose mass is 100*solar masses?
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)
The mass of a certain neutron star is 9 × 1030 kg (4.5 solar masses) and its radius is 5500 m. What is the acceleration of gravity at the surface of this condensed, burned-out star? The value of the universal gravitational constant is 6.67 × 10−11 N · m2 /kg2 . Answer in units of m/s 2 .
Imagine a hypothetical star of radius R, whose mass density ρ is constant throughout the star. The star is composed of a classical ideal gas of ionized hydrogen, so there are free protons and free electrons flying around providing the pressure support. The star is in hydrostatic equilibrium (a) What is the pressure as a function of radius in the star, P(r)? As a boundary condition, the pressure at the surface should be zero, P(R) 0 (b) What is the...
4) A binary star system consists of two stars, one of which is 1 solar mass and one of which is 2 solar masses. They are separated by a distance of 5 astronomical units and have approximately circular orbits. a) What is the orbital period of each star? b) What is the orbital velocity of each star? c) What is the angular momentum of the two star system, assuming that each star's radius is much smaller than its orbital radius?
Sirius, the brightest star in the sky, is actually a binary system. Sirius A is a main sequence star of two solar masses in orbit with Sirius B, a white dwarf star. Assuming the two stars orbit each other with an average radius of 19.85 AU, what is the period of their orbit? What is their average tangential velocity? Warm Up Sirius, the brightest star in the sky, is actually a binary system. Sirius A is a main sequence star...
5. The HR Diagram. Suppose we consider a main sequence “O star” much more massive than the sun. According to the formulae shown in lecture: a. What is the luminosity of a main-sequence O star (in solar units, Lsun) of mass 100 solar masses? b. If the sun were a 100 solar mass main-sequence O star, how much brighter would it appear from the earth? c. What is the hydrogen fusing lifetime of this star in years? d. If the...
6) Neutrons in a neutron star behave similarly to a 3D box). Calculate th masses (4.0 x 1030 kg) electrons in metal bonding Cparticles in e Fermi energy for a neutron star of radius 1okm and two solar neutron mass 939 .6 Mev
The radius of a white dwarf, in kilometers, can be approximated by the expression where the mass is in solar masses and the radius is in km. A spectral line from a white dwarf spectrum observed at a wavelength of 540.002545207479 nm is recognized to be a line with true wavelength 540 nm. What is the mass of the white dwarf that is being observed? The mass of the white dwarf is: radius -(-8(mass)13.8) 105 radius -(-8(mass)13.8) 105
In very rough numbers, galaxies have a mass of 10 billion solar masses (Mo), there are 100 billion galaxies in the Universe, and the Universe is 13 billion light-years in radius. From such estimates, calculate how many protons there are in the Universe, how many electrons, and how many neutrons.
Two stars of mass m = 0.43 and M = 15.00 (in units of solar masses) separated by a distance d = 8.00 (in units of AU, the earth-sun distance) revolve in circular orbits about their (common) center of mass as shown in the figure below. AL What is the orbital period of the larger star in years? Submit Answer Tries 0/6