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同学们知道,火车转弯时外轨高于内轨,重力与支持力的合力是转弯的向心力.在修筑铁路时,根据转弯处轨道半径和规定的行驶速度。
The students know that when the train turns, the outer rail is higher than the inner rail, and the combined force of gravity and support force is the centripetal force of the turn. When building the railway, according to the radius of the track at the turn and the prescribed speed.