A driver starts the engine of an automobile that is stopped with its front wheels resting against a curb and tries to drive over the curb. Knowing that the radius of the wheels is 12 in., that the coefficient of static friction between the tires and the pavement is 0.90, and that 60 percent of the weight of the automobile is distributed over its front wheels and 40 percent over its rear wheels, determine the largest curb height h that the automobile can negotiate, assuming 

(a) Front-wheel drive, 

(b) Rear-wheel drive.

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Fig. P8.34