You have been mining for gold and you have found a nugget and are about to be rich. the density of the gold is 19.3 grams/cubic centimeter or g/cc. your sample has a mass of 972 grams and is nearly a perfect cube, each side measuring 3 cm. find the the density of your sample (hint: you must find the volume of the cube first). after you've done this compare the given density of gold to your calculated value. is your sample pure gold? explain.

that would be because of both gravity and friction. so     c

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.