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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:宋体">如图所示，物理小组利用体积为170cm</span></span><sup><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">3</span></span></span></sup><span style="line-height:150%"><span style="font-family:宋体">的潜水艇模型（忽略进气、排气管的体积），探究潜水艇在水中如何实现上浮或下沉，下列说法不正确的是（ρ</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">水</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">＝1.0×10</span></span><sup><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">3</span></span></span></sup><span style="line-height:150%"><span style="font-family:宋体">kg/m</span></span><sup><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">3</span></span></span></sup><span style="line-height:150%"><span style="font-family:宋体">，取g＝10N/kg）（　　）</span></span></span></span></span><br />
<img src="/uploads/meth/20210702/eae3e9c6546a5af7c94731546b2911f6.png" style="float: right; width: 186px; height: 131px;" />

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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:宋体">解：A、模型浸没在水中受到的浮力F</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">浮</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">＝ρ</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">水</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">gV</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">排</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">＝1×10</span></span><sup><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">3</span></span></span></sup><span style="line-height:150%"><span style="font-family:宋体">kg/m</span></span><sup><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">3</span></span></span></sup><span style="line-height:150%"><span style="font-family:宋体">×10N/kg×1.7×10</span></span><sup><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">﹣4</span></span></span></sup><span style="line-height:150%"><span style="font-family:宋体">m</span></span><sup><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">3</span></span></span></sup><span style="line-height:150%"><span style="font-family:宋体">＝1.7N，故A选项正确。</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:宋体">       B、模型浸没后继续下沉的过程中，模型排开的体积不变，根据F</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">浮</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">＝ρ</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">水</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">gV</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">排</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">可知，模型受到的浮力不变，故B选项正确。</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:宋体">       C、若要让模型上浮，应使模型受到的浮力大于模型自身的重力，因此模型应往外排水，故C选项错误。</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:宋体">       D、潜水艇通过改变自身的重力来实现上浮和下沉，故D选项正确。</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:宋体">      故选：C。</span></span></span></span></span>

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