考点11 圆周运动及其应用
《金版教程》高考总复习首选用卷·物理(旧高考)考点11 圆周运动及其应用题组一 基础小题1.下列说法中正确的是( )A.日常生活中遇到的离心运动都是有危害的,要防止任何离心运动的发生B.在匀速圆周运动中,向心加速度是恒定的C.汽车以一定的速率通过拱桥,在最高点汽车对桥的压力小于汽车的重力D.杂技演员表演“水流星”,当“水流星”通过最高点时,处于完全失重状态,不受重力作用答案 C解析 日常生活中遇到的离心运动并不都是有危害的,如洗衣机的脱水、无缝钢管的铸造等都是利用离心运动的例子,故A错误;在匀速圆周运动中,向心加速度的方向是不断变化的,所以不是恒定的,B错误;汽车以一定的速率通过拱桥的最高点...
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