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,

maximum

acceleration from rest.

determine its

determine its