Explain why sound travels faster through iron than through air

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?

Most short-period comets do not have randomly oriented orbits because

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)