GENE eTextbook FULL SCRE trophic explosion called a supernova. This explosion blows much or all of a e supernova process, assume that the star is a solid sphere of radius R tha , in revolutions per day, of the expanding supernova shell when its radius is Oo After: expanding spherical shell Before: solid sphere n while you earn points based on the Point Potential Policy set by your instructor SAVI used

Under some circumstances, a star can collapse into an extremely dense object made mostly of neutrons and called a neutron star. A star with a of mass of 2.0x1032 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 16,000 m. What is the angular speed of the star? (Give your answer in rotations per second.) Assume the star is a solid sphere: Isphere = 2/5 MR2.   The Crab Nebula (shown below) formed from a nearby supernova (6000 light years away). Chinese astronomers observed the event in the year 1054 and since that time the nebula has been expanding into what it appears like today. The Crab Pulsar is a neutron star at the center of the nebula and the remains of the original supernova.

While you are on an archaeological dig in Egypt, you observe a scarab beetle of mass m lies on the rim of a uniform disk of mass 3.80m (3.8 times the mass of the beetle) that can rotate freely about its center like a merry-go-round. Initially, the beetle and disk rotate together with an angular velocity of 0.230 rad/s. Then the beetle walks halfway to the center of the disk. (a) what then is the angular velocity of the beetle-disk system?

A disk rotates about an axis through its center. Point A is located on its rim and point B is located exactly one fourth of the way from the center toward the rim. What is the ratio of the angular velocity ?A to that of ?B, and the tangential velocity vA to that of vB? HINT (a) the angular velocity ?A to that of ?B ?A ?B  =  (b) the tangential velocity vA to that of vB vA vB  =

A solid ball of radius r begins to roll down a hemisphere with radius R. Find the angular speed of the ball at the moment it leaves the surface of the hemisphere. Obviously, r < R.

The figure shows multiple solid disks with uniform mass distribution that are spinning about its center. The mass of the disks are the same, but they have different radii, as shown. Rank the disks by the amount of energy needed to spin the disk so that the outer edge of the disk has linear velocity v, from greatest to least. Explain your reasoning. A B с

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During a trampoline routine, a gymnast is tumbling in the air at 21 rad/s in a tuck position. He then extends into a layout position and doubles his radius of gyration just before landing on the trampoline bed.   How fast is his angular velocity in rad/s at this instant, just before landing on the trampoline bed?

A cockroach of mass m lies on the rim of a uniform disk of mass 3.00 m that can rotate freely about its center like a merry-go-round. Initially the cockroach and disk rotate together with an angular velocity of 0.434 rad/s. Then the cockroach walks halfway to the center of the disk.(a) What then is the angular velocity of the cockroach-disk system?(b) What is the ratio K/K0 of the new kinetic energy of the system to its initial kinetic energy?

Someone frequently throws a tennis ball for their dog to chase.Throughout the throwing motion, the angular velocity of their arm is 6.7radians/s, and the radius of rotation of the ball is 63.0 cm.One day they decide to test out a ball-throwing tool which effectivelyextends the radius of rotation by an extra 36 cm. Assuming all othervariables are equal, how much faster (in m/s) can they throw the ballwhen they use the launcher compared to when they don't?Express your answer to 2 decimals, and don't include units+.      Please type answer not write by hend