A train, traveling at 66 mi/h, rounds a horizontal curve of 390 ft radius. A passenger standing in the lounge notes that she must lean inward to keep from falling. Let an angle leaning inward be positive and outward be negative. At what angle from vertical must she lean? Since the radius of the curve is much greater than the height of the passenger, neglect torques. 1 mile = 5,280 ft. Answer in units of ◦ .

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