A one way, two-lane road is shared by buses and cars. Buses travel at speed 40 mph and carry 20 people. Cars travel at speed 60 mph and carry 2 people. The fraction of vehicles that are buses passing a stationary observer is 0.2. Answer the following questions: (a) What is the average vehicle occupancy seen by a stationary observer? (b) What fraction of the vehicles on an aerial photograph would be buses?

a)

Explanation:

a) since I the fraction of buses passing a stationary observer is 0.2 that means for every 10 vehicles,2 buses are seen. Therefore for every 1 bus seen 4 cars are seen

Average=[ 20+(2×4)]/ 5

=28/5

=5.6 vehicle occupancy

B) since the fraction of vehicles seen by stationary observer is 0.2

Therefore a fraction of 2 buses from an Aerial photography would be for buses.

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blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.