An automobile engine has a maximum power output of
70 hp, which occurs at an engine speed of 2200 rpm. A 10%
power loss occurs through the transmission and differential.
The rear wheels have a radius of 15.0 in. and the automobile is
to have a maximum speed of 75 mph along a level road. At this
speed, the power absorbed by the tires because of their continuous deformation is 27 hp. Find the maximum permissible drag
coefficient for the automobile at this speed. The car’s frontal
area is 24.0 ft2.
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