1. A nail at the bottom of a beaker containing glycerine appears to be 6.8 cm below the
surface of glycerine. Determine the height of the column of glycerine in the beaker
(Take the refractive index of ghcerine as 1.47)

The density of a liquid could be found by using

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?

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?