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Instead of carrying a full-size spare tire, many automobiles are equipped with a significantly smaller spare tire with a warning that the car should not exceed a speed of 50 mi/h. (a) How much pressure does the smaller tire withstand if it must support one fourth of a 1650-kg minivan and its area of contact with the road measures 8.26 cm × 15.9 cm? (b) Find the pressure on a full-size spare tire if its area of contact with the road measures 15.2 cm × 21.0 cm. (c) Why is it important to limit the speed of the smaller spare tire?
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