Over time, how do the matter and energy in a system naturally change?
a) their entropy increases
b) their energy increases
c) they do more work with less heat
d) they become more orderly

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?

An ionic compound can conduct electricity when a it is dissolved in water b its crystals are ground into powder c it is in solid form d it is heated to just below its melting point

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?