2 Select the correct answer.
An airplane on a runway accelerates at 4.0 meters/second? for 28.0 seconds before takeoff. How far does the plane travel on the runway before
takeoff?
OA 1.6 x 103 meters
OB.
17 x 103 meters
OC 3.1 x 103 meters
OD
3.3 x 103 meters
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unlike poles attract

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

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.