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To set a speed record in a measured ( straight-line)distance d, a race car must be driven first in one direction ( in time t_(1)) and then in the opposite direction( in time t_(2) ). (a) To eliminate the effects of the wind and obtain the car'sspeed v_(c) in a windless situation, should we find the average of d//t_(1) and d//t_(2)( method 1)or should we finddivide d by the average of t_(1) and t_(2) ? (b) What is the fractional difference in the two methods when a steady wind blows along the car's route and the ratio of the wind speed v_(w) to the car'sspeed v_(c) is 0.0240 ? |
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