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3. Physical period: Uniform circular motion is a kind of periodic motion. The so-called periodicity refers to the fact that after a certain period of time, the moving object repeats back to its original position, and the instantaneous speed repeats back to its original size and direction. The time it takes for an object to move in a uniform circle is called a period. The period is expressed by the symbol T, and the period is also a physical quantity describing the speed of uniform circular motion. The long period indicates the slow motion of the object, while the short period indicates the fast motion of the object.Obvious Advantages of Online Institutions:到最后还获得胜利，现在想起来几乎有些不可想象。东北某地，杨百万与妻子马丽莲经营着“仙客来大饭店”。杨百万人到中年得了不举之症，偏偏马丽莲又是个性感、泼辣的母老虎，杨百万自尊心受挫，整日忧心冲冲。终于有一天，杨百万断定马丽莲给自己戴了绿帽子，一气之下找到了神医毕见效，两人策划了一出报复马丽莲的计划… 当夜，杀手如期而至，可两个劫匪和一对临时情侣却阴差阳错的来到了饭店，并双双卷入事件当中。原本毫不相干的几拨人互相影响，使原本就扑朔迷离的局势变得更加的出人意料。每个人都为了达到各自的目的而经历了一番提心吊胆的遭遇，继而引发了一系列荒诞、可笑的怪事。与此同时，他们各自的命运也改变了…素纱下，她面色惨白，万没料到自己以郡主之尊，一再被人嫌弃，真是羞愤难耐。请教之前，杨长帆掏出了欠条先让父亲看。乔带领大卫拿到了棒球赛的全国冠军，他为了更好的发展离开了镇子。7年后，乔再次回到镇子已经是出名的棒球教练，大卫也成了棒球教练，但同时也参加了爱人的葬礼。时间的流逝与爱人的死亡在他与儿子乔之间产生了隔阂。接下来两人要如何相处……