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 9.0 days. If it were to undergo gravitational collapse to a neutron star of radius 12 km, losing 3 4 of its mass in the process, what would its rotation speed be? Assume the star is a uniform sphere at all times. Assume also that the thrown-off mass carries off either ( a ) no angular momentum , or ( b ) its proportional share ( 3 4 ) of the initial angular momentum.
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 9.0 days. If it were to undergo gravitational collapse to a neutron star of radius 12 km, losing 3 4 of its mass in the process, what would its rotation speed be? Assume the star is a uniform sphere at all times. Assume also that the thrown-off mass carries off either ( a ) no angular momentum , or ( b ) its proportional share ( 3 4 ) of the initial angular momentum.
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 9.0 days. If it were to undergo gravitational collapse to a neutron star of radius 12 km, losing
3
4
of its mass in the process, what would its rotation speed be? Assume the star is a uniform sphere at all times. Assume also that the thrown-off mass carries off either (a) no angular momentum, or (b) its proportional share
(
3
4
)
of the initial angular momentum.
Definition Definition Product of the moment of inertia and angular velocity of the rotating body: (L) = Iω Angular momentum is a vector quantity, and it has both magnitude and direction. The magnitude of angular momentum is represented by the length of the vector, and the direction is the same as the direction of angular velocity.
A star has the same size as the sun but with a mass five times as great. It rotates one revolution every five days about its axis. Suppose it collapsed into a neutron star, reducing its size to 75 percent of its original size and losing 10 percent of its mass in the process. What would be its angular speed? Assume the star to be a uniform sphere at all times. Neglect also the angular momentum accompanying the lost mass.
The 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.
A star with a of mass of 3.0x1032 kg and radius 7.0x108 m is initially rotating at a rate of once every 30 days. The star collapses into a neutron star with the same mass but a new radius of 18,000 m. What is the new angular speed of the star? (Give your answer in rotations per second.) Assume the star is a solid sphere: Isphere = 2/5 MR2.
Chapter 11 Solutions
Physics for Scientists and Engineers with Modern Physics
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