Why does a car move forward while traveling on a road, even though its wheels are equipped to spin backwards? a. the force of the road is greater than the force of the tires c. the force of the tires overcomes the force of the road b. the reaction force of the road pushes the wheels forward d. the wheels only appear to spin backwards

B. The reaction force of the road pushes the wheels forward

B. The reaction force of the road pushes the wheels forward

connect the batteries in series and hope

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.