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# A 17,000-kg tractor-trailer rig has a frontal area of 9.2 m2, a drag coefficient of

ISBN: 9780073380322 410

## Solution for problem 11-110 Chapter 11

Fluid Mechanics Fundamentals and Applications | 3rd Edition

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Problem 11-110

A 17,000-kg tractor-trailer rig has a frontal area of 9.2 m2, a drag coefficient of 0.96, a rolling resistance coefficient of 0.05 (multiplying the weight of a vehicle by the rolling resistance coefficient gives the rolling resistance), a bearing friction resistance of 350 N, and a maximum speed of 110 km/h on a level road during steady cruising in calm weather with an air density of 1.25 kg/m3. Now a fairing is installed to the front of the rig to suppress separation and to streamline the flow to the top surface, and the drag coefficient is reduced to 0.76. Determine the maximum speed of the rig with the fairing.

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