A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 20.0 min at 50.0 km/h, 16.0 min at 70.0 km/h, and 35.0 min at 55.0 km/h and spends 55.0 min eating lunch and buying gas. (a) Determine the average speed for the trip.
58.3

Incorrect: Your answer is incorrect.

Your response differs from the correct answer by more than 10%. Double check your calculations. km/h

(b) Determine the distance between the initial and final cities along the route.
km

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide

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.