港珠澳大橋有一段半徑約為120m的圓弧形彎道，路面水平。晴天時(shí)路面對(duì)輪胎的最大靜摩擦力為正壓力的0.8倍，下雨時(shí)路面被雨水淋濕，路面對(duì)輪胎的最大靜摩擦力變?yōu)檎龎毫Φ?.4倍。若汽車通過(guò)圓弧形彎道時(shí)做勻速圓周運(yùn)動(dòng)，汽車可視為質(zhì)點(diǎn)，則（　?。?/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; 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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="z6en2g5" class="m-wrap g-cw cfx"> <div id="cnsvour" class="w fl"> <div id="quas5lj" class="g-mn2"> <ul id="J_question_detail" > <li> <div id="w73kf1k" class="question-block"> <div id="6ql525b" class="q-mc"> <h1 class="q-tit"> 1. <a href="/paper/view-5019943.shtml" class="ques-origin a-pointer" target="_blank"> (2021高一下·寧波期末) </a> 港珠澳大橋有一段半徑約為120m的圓弧形彎道，路面水平。晴天時(shí)路面對(duì)輪胎的最大靜摩擦力為正壓力的0.8倍，下雨時(shí)路面被雨水淋濕，路面對(duì)輪胎的最大靜摩擦力變?yōu)檎龎毫Φ?.4倍。若汽車通過(guò)圓弧形彎道時(shí)做勻速圓周運(yùn)動(dòng)，汽車可視為質(zhì)點(diǎn)，則（　　） <p align="left"> <img width="264" height="154" src="http://tikupic.21cnjy.com/2021/07/15/da009fb7038ef7bda577854fe88966ec.png" style="max-width:100%;"> </p> </h1> <div id="zj6rvyk" class="exam-s"> <span id="dcxrncj" class="op-item"><span id="swre1zt" class="op-item-nut">A . </span><span id="6hsutzj" class="op-item-meat">汽車以20m/s的速率通過(guò)此彎道時(shí)的向心加速度約為 <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%3Cmn%3E6.0%3C%2Fmn%3E%3Cmtext%3Em%3C%2Fmtext%3E%3Cmo%3E%2F%3C%2Fmo%3E%3Cmsup%3E%3Cmtext%3Es%3C%2Fmtext%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="8ao1h0v" class="op-item"><span id="5bzlcae" class="op-item-nut">B . </span><span id="s04cg6v" class="op-item-meat">汽車以20m/s的速率通過(guò)此彎道時(shí)的角速度約為0.6rad/s</span></span> <span id="h6elb0f" class="op-item"><span id="kwaks3f" class="op-item-nut">C . </span><span id="2nccobp" class="op-item-meat">晴天時(shí)，汽車以30m/s的速率可以安全通過(guò)此圓弧形彎道</span></span> <span id="cxstkxz" class="op-item"><span id="ptmscxa" class="op-item-nut">D . </span><span id="fzdsti6" class="op-item-meat">下雨時(shí)，汽車以15m/s的速率通過(guò)此圓弧形彎道時(shí)將做離心運(yùn)動(dòng)</span></span> </div> </div> </div> </li> </ul> <div 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