如圖所示，長為R的輕桿，一端固定一個小球，另一端固定在光滑的水平軸上，使小球在豎直平面內(nèi)做圓周運動，關(guān)于小球在最高點的速度v0 ，下列說法中正確的是（　?。?/title> <link rel="stylesheet" href="http://static.zujuanyi.com/artDialog/css/ui-dialog-2023.min.css"> <link rel="stylesheet" href="http://static.zujuanyi.com/artDialog/css/artDialog-skin-ot2-2023.min.css"> <link rel="stylesheet" href="http://static.zujuanyi.com/_local/s/css/zujuanw-0e93923da6.mini.css?20243dss1ax1h">  <link rel="stylesheet" href="http://static.zujuanyi.com/_local/s/vuelib-20241226155337/vue2Lib.css?v=20240125"> <style> u { text-underline-position: under; } .grecaptcha-badge { display: none; } .JV_list { min-height: 500px; } .t-dots { font-family: Arial, Helvetica, sans-serif; } .video_shade { position: fixed; width: 100%; height: 100%; top: 0; left: 0; background: #000; opacity: .7; filter: alpha(opacity=70); z-index: 1024; } .video-play-iframe { position: fixed; overflow: hidden; width: 980px; background: #1a1a1a none repeat scroll 0 0; height: 400px; position: fixed; left: 50%; 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  <a href="/question?tree_type=category&xd=3&chid=6" class="pointer">高中物理</a> <span>/</span> <a href="javascript:;">單選題</a> </div> <div id="xffeimh" class="m-wrap g-cw cfx"> <div id="hpafqhw" class="w fl"> <div id="hywmfzs" class="g-mn2"> <ul id="J_question_detail" > <li> <div id="lshqfhu" class="question-block"> <div id="rzrbrca" class="q-mc"> <h1 class="q-tit"> 1. <a href="/paper/view-5355743.shtml" class="ques-origin a-pointer" target="_blank"> (2024高一下·紅橋期末) </a> 如圖所示，長為R的輕桿，一端固定一個小球，另一端固定在光滑的水平軸上，使小球在豎直平面內(nèi)做圓周運動，關(guān)于小球在最高點的速度v<sub>0</sub> ，下列說法中正確的是（　　）<p style="text-align:left;"><img src="http://tikupic.21cnjy.com/ct20241o/7d/48/7d483b8af6091e1bdf490f35543c3d24.png" width="148" height="151" style="max-width:100%;"></p> </h1> <div id="p9subgm" class="exam-s"> <span id="9aycmxy" class="op-item"><span id="4q005fd" class="op-item-nut">A . </span><span id="uyleibd" class="op-item-meat">v<sub>0</sub>的最小值為<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmrow%3E%3Cmi%3Eg%3C%2Fmi%3E%3Cmi%3ER%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="b4tqhsg" class="op-item"><span id="p5995ss" class="op-item-nut">B . </span><span id="ybolmco" class="op-item-meat">v<sub>0</sub>由零逐漸增大，向心力逐漸減小</span></span> <span id="0fs0zbn" class="op-item"><span id="e945kqj" class="op-item-nut">C . </span><span id="rshi4jk" class="op-item-meat">當v<sub>0</sub>由<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmrow%3E%3Cmi%3Eg%3C%2Fmi%3E%3Cmi%3ER%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">值逐漸增大時，桿對小球的彈力逐漸增大</span></span> <span id="nozb5jd" class="op-item"><span id="op45nh4" class="op-item-nut">D . </span><span id="9pt0cmf" class="op-item-meat">當v<sub>0</sub>由<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmrow%3E%3Cmi%3Eg%3C%2Fmi%3E%3Cmi%3ER%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">值逐漸減小時，桿對小球的彈力逐漸減小</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="gdfegx5" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="kwp4osy" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=58001110" width="140px" height="140px" alt=""> <p style="text-align:center;margin-top: 10px">微信掃碼預(yù)覽、分享更方便</p> </div> <div id="t55etko" class="analyize-extend JV_question__papers"> <h3 class="extend-mt">使用過本題的試卷</h3> <ul 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