Calculate the moment of inertia around the x- axis of a rectangular shape with the following dimensions: : outside length in the x direction is 26 feet, outside width in the y direction is 32 feet; the inside dimension is 24 feet in the x direction and 30 feet in the y direction. there are four openings that are 6 feet long and 1 foot wide, one on each side of the rectangle. the thickness of the rectangle is 1 foot on all four sides.

pe = weightxheight = 2000x1000=2,000,000joules

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.