Consider a tractor trailer rig having a frosted area of 9.5 m^2 with a drag coef

Question

Consider a tractor trailer rig having a frosted area of 9.5 m^2 with a drag coefficient of 0.85. The mass of the rig is 32.700 kg and the rolling resistance is 0.6% of the weight of the rig. At what speed does the aerodynamic drag first exceed the rolling resistance. Calculate the ratio of the power that is required for the rig travelling at 85 miles per hour to that travelling at 55 miles per hour (1 mile =1.61 km). Calculate the ratio of the time needed for the rig to travel over a distance L at 55 mph to that at 85 mph over the same distance L. Calculate the ratio of the energy consumption tor the rig to travel over the distance L at 85 mph to that at 55 mph over the same distance L. What conclusions can you draw from the above calculations from the viewpoint of fuel saving ?

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