2 9 consider the car in problem 2 8 if it is known that the car achiev
2.9 Consider the car in Problem 2.8. If it is known
that the car achieves maximum speed at an overall
gear reduction ratio of 2.7 to 1 with a drive axle
slippage of 3.5%, how fast would the car be going if
it could achieve its maximum speed when its engine
is producing maximum power?
2.8 A rear-wheel-drive car weighs 2600 lb and has
an 84-inch wheelbase, a center of gravity 20 inches
above the roadway surface and 30 inches behind the
front axle, a drivetrain efficiency of 85%, 14-inch-
radius wheels, and an overall gear reduction of 7
to 1. The car's torque/engine speed curve is given by
the equation M = 6ne -0.045n². If the car is on a
paved, level roadway surface with a coefficient of
adhesion of 0.75,
acceleration from rest.
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