What do comets and astroids have in common?

they are made of ice
they are orbiting the sun
they are made of metal debris
they are small compared to the planets

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is