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<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">疫情期间，人们利用</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">5G</span></span><span style="line-height:150%"><span style="font-family:新宋体">无人配送车实现了非接触安心送。如图为一辆在水平路面上匀速行驶的无人配送车，速度为</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">10km/h</span></span><span style="line-height:150%"><span style="font-family:新宋体">。空载时质量为</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">360kg</span></span><span style="line-height:150%"><span style="font-family:新宋体">，轮胎与路面的总接触面积为</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">240cm</span></span><sup><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:"Times New Roman"">2</span></span></span></sup><span style="line-height:150%"><span style="font-family:新宋体">（</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">g</span></span><span style="line-height:150%"><span style="font-family:新宋体">取</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">10N/kg</span></span><span style="line-height:150%"><span style="font-family:新宋体">）。下列说法正确的是（　　）</span></span></span></span></span><br />
                                                                                                            <img height="84" src="/uploads/meth/20201228/c81b000d635b2a4b580d072d37292105.png" width="110" />

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A B C D E F G H

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<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">解：</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:"Times New Roman"">A</span></span><span style="line-height:150%"><span style="font-family:新宋体">、该车所受的牵引力和阻力，大小相等，方向相反，作用在同一直线上，作用在同一个物体上，是平衡力，不是相互作用力，故</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">A</span></span><span style="line-height:150%"><span style="font-family:新宋体">错误；</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:"Times New Roman"">B</span></span><span style="line-height:150%"><span style="font-family:新宋体">、空载时该车对路面的压强为：</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">p</span></span><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span></span></span></span><img height="35" src="/uploads/meth/20201228/86904a1c3e391d27bad9515202cf3691.png" width="13" /><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span></span></span></span><img height="35" src="/uploads/meth/20201228/31085472475526b9adc97f23399a2a9c.png" width="13" /><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span></span></span></span><img height="36" src="/uploads/meth/20201228/421933d545af2ffd20e2b8932524883a.png" width="21" /><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span></span></span></span><img height="42" src="/uploads/meth/20201228/707afa96092c31a61e3311211ec06502.png" width="109" /><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">1.5</span></span><span style="line-height:150%"><span style="font-family:新宋体">×</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">10</span></span><sup><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:"Times New Roman"">5</span></span></span></sup><span style="line-height:150%"><span style="font-family:"Times New Roman"">Pa</span></span><span style="line-height:150%"><span style="font-family:新宋体">，故</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">B</span></span><span style="line-height:150%"><span style="font-family:新宋体">错误；</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:"Times New Roman"">C</span></span><span style="line-height:150%"><span style="font-family:新宋体">、根据</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">v</span></span><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span></span></span></span><img height="35" src="/uploads/meth/20201228/751111e2799d2e2f1b6413b303133f27.png" width="13" /><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">可知，行驶的时间为：</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">t</span></span><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span></span></span></span><img height="35" src="/uploads/meth/20201228/64dfaa5d8f1b81f95b277997d8d7f2d4.png" width="13" /><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span></span></span></span><img height="35" src="/uploads/meth/20201228/d05548b7c0efa2733b8473a9b177361f.png" width="53" /><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">0.2h</span></span><span style="line-height:150%"><span style="font-family:新宋体">＝</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">12min</span></span><span style="line-height:150%"><span style="font-family:新宋体">；故</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">C</span></span><span style="line-height:150%"><span style="font-family:新宋体">正确；</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:"Times New Roman"">D</span></span><span style="line-height:150%"><span style="font-family:新宋体">、电磁波在空气中的传播速度相同，与频率无关，故</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">D</span></span><span style="line-height:150%"><span style="font-family:新宋体">错误。</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:新宋体">故选：</span></span><span style="line-height:150%"><span style="font-family:"Times New Roman"">C</span></span><span style="line-height:150%"><span style="font-family:新宋体">。</span></span></span></span></span>

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