Which equations can be used to solve for acceleration

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?

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false