A loaded railroad car has a mass of 30 Mg and is supported by eight wheels of 800-mm diameter with 125-mm-diameter axles. Knowing that the coefficients of friction are µx = 0.020 and µk= 0.015. determine the horizontal force required (a) to get the car in motion, (b) to keep it moving with a constant velocity. Neglect the rolling resistance between the wheels and the track.
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