At least a good four or five billion from years a "dead" white now the Sun will become dwarf stac, shrinking to about 1"% of its current radius. Assume it loses no mass in this process. If the sun currently rotates once every thirty days, then how many radians per second will it be rotating at after it a white dwarf? changes into

2. The simplest way to increase the size of a circular orbit is method called a Hohmann Transfer (transfers the satellite from a small circular orbit to a larger one). It involves firing thrusters to create a change in velocity to get the satellite into a transfer orbit (elliptical), then later firing the thrusters again for another change in velocity to increase the size of the orbit (back to circular). Diagram: b Avb Transfer Initial Final Ava a Let us say we have the satellite from the previous problem in a circular orbit. We want to increase the altitude of the circular orbit from 418 km to 1000 km. (a) Find the change in velocity necessary to go into the transfer orbit, Ava. (b) Find the change in velocity necessary to go into the final circular orbit, Av. (c) How long will the transfer take? Constants needed: = G = 6.674 × 10-11 Nm² ²/kg² Re = 6.378 x 106m Mo 5.974 x 1024 kg

1.) How far, in parsecs, is an object that has a parallax of 1 arc second? How far is it, in light years? 2.) How far in parsecs, is an object that has a parallax of 0.1 arc-seconds? How far is it, in light years?

Astronomers us the P-Cygni line features in a spectrum of a supernova to... Select one alternative: ...measure the velocity of the supernova ejecta. ...to measure the rotation speed of the star that exploded. ...measure the composition of the supernova ejecta more accurately than with other lines. ...to measure the mass of the neutron star or black hole formed in the supernova.