Following statements about the translational angular momentum of the space junk, about location D, are true? Check all that apply: xp_y - yp_x is the same when the space junk is at locations A, B, and just before getting to C. The translational angular momentum of the space junk is the same when the space junk is at locations A, B, and just before getting to C. Because the space junk is traveling in a straight line, its angular momentum is zero. The translational angular momentum of the space junk is in the -z direction. (r_perp) is the same when the space junk is at locations A, B, and just before getting to C.

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

can somebody give me the answer so i can graduate