Which of the following are likely to be affected by a magnet? check all that apply.
a. a dvd
b. a credit card
c. an access card you scan for entry into a building
d. a cd

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?