In the model test of a special vehicle of junior high school physics, it drove at a constant speed of 80km / h for 6km on a straight road, consuming 1.5L of fuel, In the model test, a special purpose vehicle runs at a constant speed of 80km / h on a straight road for 6km. The fuel consumption is 1.5L. It is known that the density of gasoline is 0.7 * 10 cubic kg / M cubic, and the calorific value of gasoline is 4.5 * 10 seventh power J / kg. Assuming that the fuel is completely burned and the efficiency of gasoline engine is 40%, how much resistance does the vehicle receive in the process of driving at this speed

In the model test of a special vehicle of junior high school physics, it drove at a constant speed of 80km / h for 6km on a straight road, consuming 1.5L of fuel, In the model test, a special purpose vehicle runs at a constant speed of 80km / h on a straight road for 6km. The fuel consumption is 1.5L. It is known that the density of gasoline is 0.7 * 10 cubic kg / M cubic, and the calorific value of gasoline is 4.5 * 10 seventh power J / kg. Assuming that the fuel is completely burned and the efficiency of gasoline engine is 40%, how much resistance does the vehicle receive in the process of driving at this speed

1.5L=0.0015m^3
The total energy consumed is the volume of gasoline multiplied by the density of gasoline multiplied by the calorific value multiplied by the efficiency
W=(0.0015*0.7*10^3*4.5*10^7)*40%J=1.89*10^7J
{note: M = P * V; heat release from complete combustion: q = MQ}
W = f * s, where s is 6km
The result is f = 3.15 * 10 ^ 3N

A car runs 104.64 kilometers with 8.72 liters of gasoline. How many liters of gasoline does this car need to run 1 kilometer

8.72/104.64 = 0.08km/l, driving 1km needs 0.08l of gasoline

A car needs about 8 liters of gasoline to travel 100 km. How many liters of gasoline does it need to travel 1 km

8 △ 100 = 0.08 L