A star with mass m, period Ti = 30 days, and radius ri = 1E4 km collapses into a neutron star with a radius of rf = 3 km. Our goal will be to determine the period Tf of the neutron star. Useful formulae: Li=Lf; L=lw; w=2πf=2π/?; Isphere=2/5mr2 How much angular momentum Li does the star have before it collapses? Group of answer choices: A)riTi B)mr2i C)mivi D)Iiwi What is the rotation rate ??ωi of the star before collapsing? Group of answer choices A)riTi B)mr2i C)2π/Ti D)2πfi Suppose we model the star as a solid sphere of radius ri with moment of inertia 2/5mr2i (a good assumption). What does our description of Li read now? Group of answer choices A)2/5??2i(2πfi) B)2/5??2i(2π/Ti) C)2/5??2i(mr2i) D)2/5??2i(riTi) How
Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
A star with mass m, period Ti = 30 days, and radius ri = 1E4 km collapses into a neutron star with a radius of rf = 3 km. Our goal will be to determine the period Tf of the neutron star. Useful formulae: Li=Lf; L=lw; w=2πf=2π/?; Isphere=2/5mr2
B)mr2i
C)mivi
D)Iiwi
Group of answer choices
A)riTi
B)mr2i
C)2π/Ti
D)2πfi
Suppose we model the star as a solid sphere of radius ri with moment of inertia 2/5mr2i (a good assumption). What does our description of Li read now?
A)2/5??2i(2πfi)
B)2/5??2i(2π/Ti)
C)2/5??2i(mr2i)
D)2/5??2i(riTi)
Group of answer choices
A)mfvf
B)rfTf
C)I fwf
D)mr2f
Group of answer choices
A)2π/Tf
B)mr2f
C)2πf f
D)r f ? f
Group of answer choices
A)2/5mr2f(2πff)
B)25mr2f(rfTf)
C)25mr2f(mr2f)
D)2/5mr2f(2?/??)
Group of answer choices
A)2/5Ti
B)πr2f
C)Ti(rf/ri)2
D)2πTi
Group of answer choices
Group of answer choices
Group of answer choices
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