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.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .