Question

a) In a little over 5 billion years, our star will slough off ~20% of its...

a) In a little over 5 billion years, our star will slough off ~20% of its mass and collapse to a white dwarf star of radius 8,000 km. We will model it as a sphere. What will its angular momentum be in terms of its current angular momentum? What will its rotation period be in terms of its current period?

b) (12 points) What will its rotational kinetic energy be in terms of its current rotational kinetic energy?

Science   Advanced-Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
In a little over 5 billion years, our Sun will collapse to a white dwarf approximately...
In a little over 5 billion years, our Sun will collapse to a white dwarf approximately 16,000 km in diameter. (Ignore the fact that the Sun will lose mass as it ages.) (a) What will our Sun’s angular momentum and rotation rate be as a white dwarf? (Express your answers as multiples of its present-day values.) (b) Compared to its present value, will the Sun’s rotational kinetic energy increase, decrease, or stay the same when it becomes a white dwarf?...
Suppose a star of mass M at the end of its evolution collapses into a white...
Suppose a star of mass M at the end of its evolution collapses into a white dwarf, losing half its mass. In the cataclysmic end process the mass thrown off carries no angular momentum, but the core collapses to 1.0% of the original size of the star. a. If the original star rotated at a rate of once per 30 days, what would its new rotation rate be? b. What would be the ratio of its final rotational kinetic energy...
Suppose a star the size of our Sun (r=7.0*105 km), but with mass 6.0 times as...
Suppose a star the size of our Sun (r=7.0*105 km), but with mass 6.0 times as great, were rotating at a speed of 1.0 revolution every 10 days. If it were to undergo gravitational collapse to a neutron star of radius 10 km, losing 2/3 of its mass in the process, what would its rotation period be in μs? Assume the star is a uniform sphere at all times. Assume also that the thrown-off mass carries off no angular momentum....
The star Tau Ceti's mass is 1.6 ✕ 1030 kg, its radius is 5.5 ✕ 105...
The star Tau Ceti's mass is 1.6 ✕ 1030 kg, its radius is 5.5 ✕ 105 km, and it has a rotational period of approximately 34 days. If Tau Ceti should collapse into a white dwarf of radius 9.7 ✕ 103 km, what would its period (in s) be if no mass were ejected and a sphere of uniform density can model Tau Ceti both before and after? _______ s
Suppose a star the size of our Sun, but of mass 8.0 times as great, was...
Suppose a star the size of our Sun, but of mass 8.0 times as great, was rotating at a speed of 1.0 revolution every 21 days. If 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
Suppose a star with the Sun’s mass and radius (the radius of the Sun is 6.96×108...
Suppose a star with the Sun’s mass and radius (the radius of the Sun is 6.96×108 m) is rotating with a period of 25 days. The star first blows off its outer layers and loses mass and angular momentum before the actual collapse, thereby reducing its radius while maintaining the same density. Then, with a mass that is 59 % of the Sun’s mass, it collapses to a white dwarf with a rotation period is 131 s. A) What is...
Suppose a star the size of our Sun, but with mass 5.0 times as great, were...
Suppose a star the size of our Sun, but with mass 5.0 times as great, were rotating at a speed of 1.0 revolution every 15 days. If it were to undergo gravitational collapse to a neutron star of radius 14 km , losing three-quarters of its mass in the process, what would its rotation speed be? Assume also that the thrown- off mass carries off either Part A) No angular momentum Part B) its proportional share three-quarters of the initial...
A white dwarf star (R = 0.0073 R⦿, M= 1.4 M⦿) goes over the Chandrasekhar limit...
A white dwarf star (R = 0.0073 R⦿, M= 1.4 M⦿) goes over the Chandrasekhar limit and collapses to a neutron star (R=10 km). At that point the collapse stops. The collapse time is 0.1 seconds. A) Calculate the total amount of energy liberated from the star in the collapse. B) Estimate the luminosity (energy liberated/collapse time). C) If the white dwarf was originally spinning with a 1.3 day period, what would the period of the neutron star rotation be?
Suppose a star the size of our Sun, but with mass 8.0 times as great, were...
Suppose a star the size of our Sun, but with mass 8.0 times as great, were rotating at a speed of 1.0 revolution every 8.0 days. If it were to undergo gravitational collapse to a neutron star of radius 11 km , losing three-quarters of its mass in the process, what would its rotation speed be? Assume also that the thrown- off mass carries off either a) no angular momentum b)its proportional share three-quarters of the initial angular momentum Express...
Neutron Star Physics Under some circumstances, an ordinary star can undergo gravitational collapse into an extremely...
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 sphere, both before and after the collapse. The original star's initial radius is 7.0 x 105 km (comparable to the size...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT