Recent findings lend strong support to the theory that a black hole lies at the center of the milky way and of many of the 100 billion other galaxies estimated to exist in the universe.
(a) that a black hole lies at the center of the milky way and of
(b) that a black hole lies at the milky way's center and
(c) that there is a black hole lying at the milky way’s center and
(d) of a black hole lying at the milky way's center and
(e) of a black hole that lies at the center of the milky way and of

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

truck y has a greater velocity than truck x.

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.