UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
11th Edition
ISBN: 9781319278670
Author: Freedman
Publisher: MAC HIGHER
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Question
Chapter 20, Problem 9CC
To determine
Whether a 1-M☉ core of iron collapses and produces a supernova, given that Sun cannot create the pressure necessary to fuse silicon into iron.
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The star HD 69830's mass is 1.7 ✕ 1030 kg, its radius is 6.3 ✕ 105 km, and it has a rotational period of approximately 35 days. If HD 69830 should collapse into a white dwarf of radius 7.8 ✕ 103 km, what would its period (in s) be if no mass were ejected and a sphere of uniform density can model HD 69830 both before and after?
A distant Nebula is now 2.35 pc in radius and is expanding at 1100 km/s. Approximately when did the supernova occur?
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Chapter 20 Solutions
UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- What observations from SN 1987A helped confirm theories about supernovae?arrow_forwardA supernova can eject material at a velocity of 10,000 km/s. How long would it take a supernova remnant to expand to a radius of 1 AU? How long would it take to expand to a radius of 1 light-years? Assume that the expansion velocity remains constant and use the relationship: expansiontime=distanceexpansionvelocity .arrow_forwardHow would the spectra of a type II supernova be different from a type Ia supernova? Hint: Consider the characteristics of the objects that are their source.arrow_forward
- Suppose we represent an ordinary star as a uniform solid rigid sphere. The star’s initial radius is 644000 km (comparableto the size of our sun). After it collapses, forming a neutron star, its final radius is only 18.3 km! If the original starmakes one complete rotation about its axis once per month (every 30 days), find the neutron star’s period of rotationjust after the original star has collapsed.Tafter = (in s)arrow_forwardWhat is the answer below if the radius of the neutron star is 29.894 km? (express your answer in the proper SI unit and without scientific notation) What is the average density of a neutron star that has the same mass as the sun but a radius of only 20.0 km?arrow_forwardThe core of a star collapses during a supernova, forming a neutron star. Angular momentum of the core is conserved, and so the neutron star spins rapidly. If the initial core radius is 5.0×105 km and it collapses to 10.0 km, find the neutron star’s angular velocity in revolutions per second, given thecore’s angular velocity was originally 1 revolution per 30.0 days.arrow_forward
- A star collapses onto a neutron star. If its original radius is 7x105 km, by what factor will its spin rate increase?arrow_forwardA supernova remnant was observed in 2007 to be expanding at a velocity of 14,000 km/s and had a radius of 6.5 light-years. Assuming a constant expansion velocity, in what year did this supernova occur?arrow_forwardHow is a nova different from a type Ia supernova? How does it differ from a type II supernova?arrow_forward
- The core of a star collapses during a supernova, fanning a neutron star. Angular momentum of the core is conserved, so the neutron star spins rapidly. If the initial core radius is 5.0105km and it collapses to 10.0 km, find the neutron star's angular’ velocity in revolutions per second, given the core’s angular’ velocity was originally 1 revolution per 30.0 days.arrow_forwardThe core of a star collapses during a supernova, forming a neutron star. Angular momentum of the core is conserved, and so the neutron star spins rapidly. If the initial core radius is and it collapses to 10.0 km, find the neutron star’s angular velocity in revolutions per second, given the Core’s angular velocity was originally 1 revolution per 30.0 days.arrow_forward
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