An artillery shell is fired at an angle of 83.3 ◦ above the horizontal ground with an initial speed of 1600 m/s. the acceleration of gravity is 9.8 m/s 2 . find the total time of flight of the shell, neglecting air resistance. answer in units of min. 002 (part 2 of 2) 10.0 points find its horizontal range, neglecting air resistance. answer in units of km.

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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.