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class="top-register-item">注冊(cè)</a> </li> </ul> </div> </div> </div> <div id="p19trzf" class="crumbs g-cw"> <i class="iconw-fixed"></i> <span>當(dāng)前位置：</span>   <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="bbrtpxb" class="m-wrap g-cw cfx"> <div id="r5r5pzj" class="w fl"> <div id="jfxbb9z" class="g-mn2"> <ul id="J_question_detail" > <li> <div id="bvpllpj" class="question-block"> <div id="jzpl9x9" class="q-mc"> <h1 class="q-tit"> 1. <a href="/paper/view-2652661.shtml" class="ques-origin a-pointer" target="_blank"> (2020·蕪湖模擬) </a> 一足夠長的傳送帶與水平面的傾角為<i>θ</i> ，以一定的速度勻速運(yùn)動(dòng)，某時(shí)刻在傳送帶適當(dāng)?shù)奈恢梅派暇哂幸欢ǔ跛俣鹊男∥飰K，如圖甲所示，以此時(shí)為計(jì)時(shí)起點(diǎn)<i>t</i>=0，小物塊之后在傳送帶上運(yùn)動(dòng)速度隨時(shí)間的變化關(guān)系如圖乙所示，圖中取沿斜面向上的運(yùn)動(dòng)方向?yàn)檎较颍?i>v</i><sub>1</sub>><i>v</i><sub>2</sub> ，已知傳送帶的速度保持不變，則（） <p align="left"> <img width="256" height="129" src="http://tikupic.21cnjy.com/bf/5c/bf5c2e1897cf419bf792ca145e34ad77.jpg" style="max-width:100%;"> </p> </h1> <div id="dpjhbjv" class="exam-s"> <span id="pbrrpzd" class="op-item"><span id="rdxztzd" class="op-item-nut">A . </span><span id="zrnnhv9" class="op-item-meat">小物塊與傳送帶間的動(dòng)摩擦因數(shù)μ<tanθ</span></span> <span id="l1vrpvf" class="op-item"><span id="5vtrj9d" class="op-item-nut">B . </span><span id="ltljjpr" class="op-item-meat">小物塊在0~<i>t</i><sub>1</sub>內(nèi)運(yùn)動(dòng)的位移比在<i>t</i><sub>1</sub>~<i>t</i><sub>2</sub>內(nèi)運(yùn)動(dòng)的位移小</span></span> <span id="x5bxr5n" class="op-item"><span id="9tjpnrv" class="op-item-nut">C . </span><span id="tbt5nrz" class="op-item-meat">0~<i>t</i><sub>2</sub>內(nèi)，傳送帶對(duì)物塊做功為 <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%3Cmi%3EW%3C%2Fmi%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmfrac%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmfrac%3E%3Cmi%3Em%3C%2Fmi%3E%3Cmsubsup%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsubsup%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3Cmfrac%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmfrac%3E%3Cmi%3Em%3C%2Fmi%3E%3Cmsubsup%3E%3Cmi%3Ev%3C%2Fmi%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="j5phbnp" class="op-item"><span id="xhtvpz5" class="op-item-nut">D . </span><span id="lvr55b5" class="op-item-meat">0~<i>t</i><sub>2</sub>內(nèi)物塊動(dòng)能變化量大小一定小于物體與皮帶間摩擦而產(chǎn)生的熱量</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="rzp5xfj" id="J_ConnectQuestionsdBox"> 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