A loaded railroad car has a mass of 30 Mg and is supported by eight 800 mm diameter wheels with 125 mm diameter axles Knowing that the coefficients of friction are s 0 020 and k 0 015, determine the horizontal force required (a) To start the car moving, (b) To keep the car moving at a constant spee...

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A loaded railroad car has a mass of 30 Mg and is supported by eight 800-mm-diameter wheels

Question:

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