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		<h1>Giải bài tập Vật lý 10 bài 31&#x3A; Phương trình trạng thái của khí lí tưởng</h1>
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			Giải bài tập Vật lý 10 bài 31: Phương trình trạng thái của khí lí tưởng
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			<div style="text-align: justify;"><strong><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">A/ HƯỚNG DẪN TRẢ LỜI CÁC CÂU HỎI SGK VẬT LÝ 10 TRANG 165, 166</span></span></span></strong><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>1. Khí lí tưởng là gì?</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i>Trả lời</i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Chất khí trong đó các phân tử được coi là các chất điểm và chỉ tương tác khi va chạm gọi là khí lí tưởng.</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>2. Lập phương trình trạng thái của khí lí tưởng. </b></span></span></span><br  />
<img alt="giai bai tap vat ly 10 bai 31 cau A2" height="353" src="https://sachgiai.com/uploads/news/2019_07/giai-bai-tap-vat-ly-10-bai-31-cau-a2.jpg" width="500" /><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>3. Viết hệ&nbsp;thức sự nở đẳng áp của chất khí.</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i>Trả lời:</i></b></span></span></span><br  />
<img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-1.png" width="14" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>= </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-2.png" width="14" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span></span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>4. Hãy ghép tên các quá trình đối với một lượng khí xác định bên trái với các phương trình tương ứng ghi bên phải:</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">1. Quá trình đẳng nhiệt.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; a)&nbsp;</span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-3.png" width="14" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>= </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-4.png" width="14" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">2. Quá trình đẳng tích.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b) </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-5.png" width="14" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>&nbsp;= </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-6.png" width="14" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">3. Quá trình đẳng áp.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;c) p<sub>1</sub>V<sub>1</sub> = p<sub>2</sub>V<sub>2</sub></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">4. Quá trình bất kì.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;d) </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-7.png" width="28" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>= </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-8.png" width="28" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>Đáp án: </b>1 -&gt; c; 2 -&gt; a; 3 -&gt; b; 4 -&gt; d</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>5. Trong hệ tọa độ (V, T) đường biểu diễn nào sau dây là đường đẳng áp?</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">A. Đường thẳng song song với trục hoành.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">B. Đường thẳng song song với trục tung.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">C. Đường hypebol.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">D. Đường thẳng kéo dài đi qua gốc tọa độ.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Đáp án: D</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>6. Mối liên hệ giữa áp suất, thể tích, nhiệt độ của chất khí trong quá trình nào sau đây không được xác định bằng phương trình trạng thái của khí lí tưởng?</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">A.&nbsp; Nung nóng một lượng khí trong một bình đậy kín.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">B.&nbsp; Nung nóng một lượng khí trong một bình không đậy kín.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">C. Nung nóng một lượng khí trong một xilanh có pit-tông làm khí nóng lên, nở ra, đẩy pit-tông di chuyển.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">D. Dùng tay bóp lõm quả bóng bàn.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Đáp án: B</span></span></span><br  />
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<strong><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">7. Trong phòng thí nghiệm người ta điều chế được 40 cm<sup>3</sup> khí hiđrô ở áp suất 750 mmHg và nhiệt độ 27<sup>o</sup>C. Tính thể tích của lượng khí trên ở điều kiện chuẩn (áp suất 760 mmHg và nhiệt độ 0°C).</span></span></span><br  />
<em><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Giải</span></span></span></em></strong><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Trạng thái 1:</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">p<sub>1</sub> = 750 mmHg; V<sub>1</sub> = 40 cm<sup>3</sup>; T<sub>1</sub> = 300 K</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Trạng thái 2:</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">p<sub>2</sub> = 760 mnHg; V<sub>2</sub> =?; T<sub>2</sub> = 273 K</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Từ phương trình trạng thái của khí lí tưởng:</span></span></span><br  />
<img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-20.png" width="28" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>= </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-21.png" width="28" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Ta có:</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">V<sub>2</sub> = </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-22.png" width="42" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>= </span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-23.png" width="67" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>&nbsp;</span></span></span><img alt="" height="25" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-24.png" width="14" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:5.5pt"> </span></span></span></span></span>35,92 cm<sup>3</sup></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Đáp số: V<sub>2</sub> = 35,92 cm<sup>3</sup></span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>8. Tính khối lượng riêng của không khí ở đỉnh núi Phan-xi- păng cao 3140 m. Biết rằng mỗi khi lên cao thêm 10 m thì áp suất khí quyển giảm 1 mmHgvà nhiệt độ trên đỉnh núi là 2°C. Khối lượng riêng của không khí ở điều kiện chuẩn (áp suất 760 mmHg và nhiệt độ 0°C là 1,29 kg/m<sup>3</sup>) </b></span></span></span><br  />
<img alt="giai bai tap vat ly 10 bai 31 cau B2" height="420" src="https://sachgiai.com/uploads/news/2019_07/giai-bai-tap-vat-ly-10-bai-31-cau-b2.jpg" width="500" /><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>B.&nbsp;</b></span></span></span><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>BÀI TẬP LUYỆN TẬP<br  />
1. Một lượng khí chuyển trạng thái như sơ đồ hình 31-2. Hãy cho biết:<br  />
<img alt="giai bai tap vat ly 10 bai 31 cau A6" height="142" src="https://sachgiai.com/uploads/news/2019_07/giai-bai-tap-vat-ly-10-bai-31-cau-a6.jpg" width="200" /></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Lượng khí chuyển từ trạng thái (1) sáng trạng thái (1&#039;) bằng quá trình nào? Hãy viết biểu thức liên hệ giữa p<sub>1’</sub>, V<sub>1</sub> và p<sub>1</sub> V<sub>2</sub>.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Lượng khí chuyển từ trạng thái (V) sang trạng thái (2) bằng quá trình nào? Hãy viết biểu thức liên hệ giữa p<sub>1’</sub>, T<sub>1</sub>, và p<sub>2</sub>,T<sub>2</sub>.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Từ hai biểu thức trên hãy chứng minh rằng:</span></span></span><br  />
<img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-9.png" width="28" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>= </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-10.png" width="28" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>= </span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-11.png" width="17" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>= const</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i>Trả lời:</i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Lượng khí chuyển từ trạng thái (1) sáng trạng thái (1’) bằng quá trình đẳng nhiệt:</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">T<sub>1</sub> = T<sub>1’</sub> = const</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">p<sub>1</sub>V<sub>1</sub> = p<sub>1’</sub>,V2 (i)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Lượng khí chuyển từ trạng thái (1’) sáng trạng thái (2) bằng quá trình đẳng tích:</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">V<sub>1’</sub> = V<sub>2</sub> =5 const</span></span></span><br  />
<img alt="" height="36" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-12.png" width="20" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>= </span></span></span><img alt="" height="36" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-13.png" width="15" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (ii)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Từ biểu thức (i) ta có:</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">p<sub>1’</sub> = </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-14.png" width="28" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (iii)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Thế (iii) vào (ii) ta được:</span></span></span><br  />
<img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223417-15.png" width="28" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>&nbsp;= </span></span></span><img alt="" height="36" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-16.png" width="15" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">=&gt; </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-17.png" width="28" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>= </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-18.png" width="28" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>= </span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-19.png" width="22" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>const (dpcm)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>2. Áp suất của hỗn hợp khí trong xi lanh một động cơ vào cuối thời kì nén là bao nhiêu? Biết rằng trong quá trình nén, nhiệt độ tăng từ 40°C đến 270°C, thể tích giảm từ 0,9 </b></span></span></span><img alt="" height="25" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-25.png" width="7" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:5.5pt"> </span></span></span></span></span><b>&nbsp;đến 0,15 </b></span></span></span><img alt="" height="25" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-26.png" width="7" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:5.5pt"> </span></span></span></span></span><b>, áp suất ban dầu là 6.10<sup>4</sup> N/m<sup>2</sup>.</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i>Hướng dẫn giải</i></b></span></span></span><br  />
<img alt="giai bai tap vat ly 10 bai 31 cau C4" height="243" src="https://sachgiai.com/uploads/news/2019_07/giai-bai-tap-vat-ly-10-bai-31-cau-c4.jpg" width="500" /><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>3. Trong xi lanh của một động cơ đốt trong có 3 dm<sup>3</sup> hỗn hợp khí dưới áp suất 1 at và nhiệt độ 37°C. Pit-tông nén xuống làm cho thể tích của hỗn hợp khí chỉ còn 0,5 dm<sup>3</sup> và áp suất tăng lên tới 12 at. Tính nhiệt độ của hỗn hợp khí nén.</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i>Hướng dẫn giải</i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Trạng thái 1:</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">P<sub>1</sub> = 1 at; V<sub>1</sub> = 3 dm<sup>3</sup>; T<sub>1</sub> = 310 K</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Trạng thái 2;</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">p<sub>2</sub> = 12 at; V<sub>2</sub> = 0,5 dm<sup>3</sup>; T<sub>2</sub> =?</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Từ phương trình trạng thái của khí lí tưởng:</span></span></span><br  />
<img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-27.png" width="28" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>= </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-28.png" width="28" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Ta có:</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Ta có:</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">T<sub>2</sub> = </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-29.png" width="42" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:12.0pt"> </span></span></span></span></span>= </span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-30.png" width="62" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>= 620 K</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Đáp số: T<sub>2</sub> = 620 K</span></span></span><br  />
<br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>4. Pit-tông của một máy nén sau mỗi lần nén đưa được 5</b></span></span></span><img alt="" height="25" src="https://sachgiai.com/uploads/news/2019_07/image-20190705223418-31.png" width="7" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:5.5pt"> </span></span></span></span></span><b>&nbsp;khí ở nhiệt độ 37°C và áp suất 1 at vào bình chứa khí có thể tích 2,5 m<sup>3</sup>. Tính áp suất của khí trong bình khi pit-tông đã thực hiện được 1200 lần nén. Biết nhiệt độ khí trong bình là 50°C.</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i>Hướng dẫn giải</i></b></span></span></span><br  />
<img alt="CAU C6" height="250" src="https://sachgiai.com/uploads/news/2019_07/giai-bai-tap-vat-ly-10-bai-31-cau-c6.jpg" width="500" /><br  />
<br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>5. Khi tăng nhiệt độ tuyệt đối của một khối khí lí tưởng lên 2,4 lần thì áp suất tăng 20%. Hỏi khi đó thể tích tăng hay giảm bao nhiêu phần trăm so với thể tích ban đầu? </b></span></span></span><br  />
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