What is the standard reduction potential for the half cell s2-.

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?

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?