The compass of an airplane indicates that it is headed due north, and its airspeed indicator shows that it is moving through the air at 400 km/h. there is a wind of 300 km/h from west to east. (a) in what direction is the airplane actually heading? [note: calculate the degree measure of the angle and specify e of n or w of n] (b) expressed in hours, how long a time will it take the airplane to cover a distance of 2000 km?

where is the photo and the answer choices?

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.